You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version If you want to define *pc=2sigma/r* you can do it as a local variable of your 2d axisymmetrical geometry (comp1) but not as a global variable. Here f is 1 inside a domain and 0 else. How to find the in built functions such as integrate. Note: This discussion is about an older version of the COMSOLMultiphysics software. It demonstrates how to define global parameters and variables. Discussion Closed This discussion was created more than 6 months ago and has been closed. This is a tutorial for COMSOL 4.2. -- 2*pi*r^2 I want to use these values as initial values of a variable in comsol. Poissons ratio, nu Viewing and Accessing the Equations and Variables for Physics - COMSOL y is my shear rate and can also be written as "spf.sr" and n is a variable I defined already. Here the excerpt from Comsol documentation : How to define variable regard to time dependent steps? - comsol.fr Include function as a variable - COMSOL For example with dest(x)=2*dest(y)=1/4 the above example should give the answer G = 0.6563 (=21/32). I am specifically looking for summation as in Fourier and Taylor series. -- Trivially we also have for dest(x)=dest(y)=0, that G = intop((dom==1)*1)=1. Best regards, Magnus Ringh, COMSOL In such a case, only damping coefficient and source term are non-zero. I strongly suspect that the RF module can do this, but my license does not include it and I don't intend to waste any more of my advisor's funds. Analytic functions take one or more argument that you define directly in the Settings window for the Analytic function. I am using Coefficient Form PDE physics. Discussion Closed This discussion was created more than 6 months ago and has been closed. In comsol, how can we get this kind of integration? Thanks. Also define a new variable, Temperature, to visualize the temperature in all domains in the postprocessing analysis. You need global. Using global parameters it is very easy to change geometry easily. Discussion Closed This discussion was created more than 6 months ago and has been closed. Since it is important that all x,y values are considered in f(x+dest(x),y+dest(y)), I chose the second alternative II) above to procede. If you master this you get away with many frustrating subjects, and you quickly learn how to design/build very efficient geometries for your models in the COMSOL CAD environment. Jeff. thanks in advance. or both? When current I flows in the conductor the magnetic flux density produced at point (x0,y0,z0) will be Best PHYSICS SETTINGS Define the following parameters for the materials: The thermal conductivity, k The heat capacity, C The density, rho Young's modulus, E Poisson's ratio, nu The thermal expansion coefficient, alpha and Tempereature Regards, Rashedul I have problems to define a specific function G(x,y) involving an integral of the kind \int \int f(x+dest(x),y+dest(y))*f(x,y) dx dy. A continuous range of values takes infinitely long to evaluate. [/QUOTE] Best regards, Thanks, Hi, You can define a variable as 2*pi*r^2 in an axisymmetric model where r is a spatial coordinate, for example. there are a few concepts and implicit usage of references and variables that are essential to be able to use COMSOL efficiently. How can I see the equations COMSOL is defining? which version, and precise physics are you using ? Try a search on the forum, I have discussed this several times here already ;) Posted May 19, 2015, 3:04 a.m. EDT Then again T might well be T(x,y,z,) and so on For the source term f I use: d (intX,x)-f (x,y). COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH), How to Use State Variables in COMSOL Multiphysics. I would be really happy if you help me, is a range from 5 to 12 with 101 points. Hi You can define a variable as Materials, Parameters, Variables, & Functions, COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH), How to Use State Variables in COMSOL Multiphysics, Mode Analysis for Electromagnetic Waveguides in COMSOL. How to Specify Material Properties with Functions in COMSOL - YouTube You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version Hi How to define a variable which is different at the start time t=0 - COMSOL You should then remain with two boundaries, overlapping) where you apply your "fan effect" or equations to link velocity or whatever variable discontinuity you need. Peter. Your internet explorer is in compatibility mode and may not be displaying the website correctly. In matlab, we can use int(f(x),x0,x1) which represents the integration of f(x) from x0 to x1? Hi Ivar , Hello everyone, I would like to define a variable suppose 'a' that starts from 0 to 1 with stepsize=0. Aref Shaikh. [QUOTE] How and where from can i define the following variable for subdomain in comsol3.5a? But now comes the tricky part, how do I write in Comsol that f(x+dest(x),y+dest(y)) = 1 only when x+dest(x),y+dest(y) \in dom 1 (else 0)? You should use a nonzero step size for the range function. Hope this helps on the way Michael Rembe. How to define a new PDE in COMSOL? | ResearchGate Note: This discussion is about an older version of the COMSOLMultiphysics software. Worked perfectly for me. Youngs modulus, E But rho might also change with position within a given material block (i.e.due to extreme pressures), or it changes with temperature hence in all generality one should write "solid.rho_i(x,y,z,T,)". This is done by adding a "constraint" to the boundary where x=0 with reaction term R=-intX. For integration of f(x,y) from 0 to x I use a separate "General form PDE" with a dependent variable intX on the domain of the function. Define the following parameters for the materials: do it with integrate(expr,var,lower,upper) operator defining some variable tempInt. If I use the built-in integrate()-operator for this, I get an error-message. How to define a variable for a range of values? - comsol.it How to Use State Variables in COMSOL Multiphysics Using variables to define material - COMSOL Multiphysics Because the microrobot legs consists of several materials with different material properties, you have to define subdomain settings for each materials. Fluid & Heat, Computational Fluid Dynamics (CFD), Porous Media Flow Thank you so much! Defining a variable. - COMSOL Multiphysics Ivar Kjelberg "Retired" but still part time CSEM SA (CH) One way I like evaluating my ranges is using normalized ranges, for example: listed if standards is not an option). In the settings I set all coefficients of the PDE to zero exept for the source term f. For the source term f I use: d(intX,x)-f(x,y). The information provided may be out of date. But this variable could be either for a domain or for a boundary, as mentioned in the doc. COMSOL Multiphysics is a general-purpose software platform, based on advanced numerical methods, for modeling and simulating physics-based problems. How to Define a Variable in Comsol? How can we define? Now you apply again "Finish - Assembly mode". listed if standards is not an option). So, you can use the calculated outcome as a variable in your boundary. How to define region heat source with 3D variables using the If else condition? This tool enables you to document all the details of your entire model. Thank you so much! I am trying to simulate a spontaneous fluid uptake process in a rock where capillary pressure is the driving force. . The expressions for lower and upper limits do not have to be constants but are required to evaluate to real values. Thanks Dr. Ivar for your interesting reply that sheds light on a matter that we can't find by reading the docs, but only through experience. With COMSOL Multiphysics, you will be able to account for coupled or multiphysics phenomena. integrate(expr,var,lower,upper) computes the integral of expr for the integration variable var over an interval specified by expressions lower for the lower limit and upper for the upper limit. That is, you can define it without specifying the actual names of the arguments that you will use when calling it. Hi To start a new discussion with a link back to this one, click here. Worked perfectly for me. How to find the in built functions such as integrate. I would appreciate your help in setting up this problem in COMSOL. ): By the way in V4 the GUI are rather different, you should consider if its worth to spend too much time on the older 3.5, rather from jumping straight into 4.1 or newer It is useful where you specify lists of values: In the Times field for the output times from a time-dependent study, for example. Share Improve this answer Follow answered Jan 7, 2021 at 1:01 Sameep Shah 11 1 Add a comment Your Answer I hope this helps. I can calculate the area of dom 1 either as I) intop(1)=1 on dom 1, or as II) intop( (dom==1)*1)=1 on all domains. I hope this helps. Excuse me if my explanation is not clear enough Now, the problem is that I want to vary the absorption coefficient "a" according to the material of the regions I define. For example, I hope to do write something like "(x,y) in domain1" that will return 1 if the coordinates (x,y) are in the domain and 0 otherwise. Use the Variables node to define expressions as user-defined variables. The information provided may be out of date. and hare you sure you define these functions and use the variables in the right environment (global definitions or local domain definitions. Posted Dec 8, 2010, 7:32 p.m. EST Once you've added this feature, you can define variables on any geometric entity level, including: Domains Boundaries Edges Points I hope this helps. 5 + 7 * range(0, 0.01, 1)^2 For the diagnosis I am using electromagnetic Induction Method. So physical parameters are entered on the domains principally. You have to study the chapter of "Integration Coupling Variables" in the doc, there are different types, not only on a border or a subdomain (projection or extrusion items), in the worst case you add a few specific interiour subdomains, sometimes this is simpler. upper limit Of Dependent Variable comsol - Stack Overflow Ivar. I find that these could be better explained, as it took me very long before I started to feel confortable, so I do understand your issue there :) Is there a way to speed it up? The information provided may be out of date. where a ranges from 0 to 0.707. where we use a nested if statement to assign domain 1 the relative permitivity of espislonr_air, domain 2 epsilonr_container, and the remaining domain epsilonr_ball. Hello Dr Ivan, Thanks Dr. Ivar for your interesting reply that sheds light on a matter that we can't find by reading the docs, but only through experience. Magnus Ringh, COMSOL. Np depends on a field variable Vm ( Vm = a * (ec.normE/maximumOf (ec.normE)) where a can be any number b/w 0.5 to 3). pH = -log ( [H+] [M]). Thanks for the reply Daniel. \int \int f(x+dest(x),y+dest(y))*f(x,y) dx dy = \int \int f(x+dest(x),y+dest(y))*(dom==1) dx dy. I know I could set up a "General projection" for this but I noticed that this is computationally very expensive. For f(x) from 0 to x, is it int(f(x),0,x)? By doing so the problem is converted from an integration to a differentiation and therefore a boundary condition needs to be set. If you want to define pc=2sigma/r you can do it as a local variable of your 2d axisymmetrical geometry (comp1) but not as a global variable. How can I define a parameter with range a to b if I don't want to Then you can multiply your exquation by a boolean (x. Then I get small steps at the beginning but larger steps at the end but I don't need to do any math to figure out how to adjust the function. What you can do is draw 2 lines exactly at the positions you want to carry on the integration. As I inject the current, the magnetic flux density that is produced is to be measured. Regards i was looking and learning some Model in Comsol library and it was in an axisymmetric model where r is a spatial coordinate, for example. Posted 9 apr 2018, 16:56 GMT-4 Fluid & Heat, Computational Fluid Dynamics (CFD), Parameters, Variables, & Functions 0 Replies. The range function returns a list (vector) of values, and it is therefore not applicable in the Variables definitions, so it should not work in any of the cases you describe. Ivar. Posted Feb 10, 2011, 11:48 a.m. EST In the manual, but what is the scope etc here? PHYSICS SETTINGS Define the following parameters for the materials: The thermal conductivity, k The heat capacity, C The density, rho Young's modulus, E Poisson's ratio, nu The thermal expansion coefficient, alpha and Tempereature Regards, Rashedul Best regards Michael Rembe ------------------- Best, The necessity of functions, Gaussian Pulse, Ramp, Rectangle, Step, Triangle, Waveform, RandomGaussian Distribution Function: http://hyperphysics.phy-astr.gsu. Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here. The homogenous, time harmonic case of the wave equation is simply the Helmholtz equation, which is already built in COMSOL. Good luck To start a new discussion with a link back to this one, click here. (06) Global Parameters - COMSOL 4.2 Tutorial - YouTube The key is the "dom" variable, which is used for inserting probes as well. I am trying to add this variable as a. I don't understand what you want to simulate! Under Component right-click Definitions and choose Variables, or click Local Variables in the Definitions toolbar (Windows users). Update: never mind, I figured out how to do it in COMSOL 5.2. COMSOL is different from many other FEM tools, these physical parameters are defined on the geometric "elements" and not into the mesh, the mesh elments are mapped on the domains and boundary , and the mesh heritate the physical properties from the domains respective boundaries. comsol multiphysics price list 2021 Am I right on this one? B=uI/(4pi)*[cos(45)*integrate((y0-a)/r^3,a,0,cos(45))-sin(45)*integrate((x0-a)/r^3,a,0,sin(45))]. Version 5.4 In this way COMSOL looks after the continuity on the "interiour boundaries" for you and you have only to deal specifically with the two overlapping points do define some variables to link them together the way you want (or to apply specific Boundary physics on them) How to define Function in Definitions / Variables. - comsol.ru This way if the value of your variable goes above the limit, comsol will just use the value of the limit. -- Variables & Functions in Comsol 4 | PDF | Parameter (Computer - Scribd Usually the richard's equation (for example) is solved for the capillary pressure pc and the velocities u, v, w are results of d (Pc,x), d (Pc,y) and d (Pc,z). defining a variable - COMSOL This would allow me to used more complicated boundaries (e.g. basically most variable depend on their context, such as spatial dimensions x,y,z or r,phi and the Entities (Domains, Boundaries, Edges or Points). Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. Then in integration you choose the boundaries , if it is domain or boundary you will see how you can pick up just the space between your lines. 2 Replies, Please login with a confirmed email address before reporting spam. Ali, Hi I think this is due to the fact that this operator is supposed to be used for postprocessing only but not for solving. The thermal conductivity, k Thanks! This is done by adding a "constraint" to the boundary where x=0 with reaction term R=-intX. 08. Functions in COMSOL Multiphysics - I - YouTube The information provided may be out of date. Fluid & Heat, Computational Fluid Dynamics (CFD), Porous Media Flow, Sampling Random Numbers from Probability Distribution Functions, Time-dependent results are different with different time-range, Getting the Stats: Computing Standard Deviations and Other Statistical Quantities, Range of temperature and pressure for initial condition. At different Pc values, subsequent variables are also calculated such as Se, krw, etc. Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. How can I define variables that takes range values in Comsol? John. I found something like: Subdomain Expressions : Simulating the Tunneling Current Across a Graded Heterojunction. I'm not sure what you want to do, but I can see a couple of issues here: Once you've added this feature, you can define variables on any geometric entity level, including: Domains Boundaries Edges Points (root.mod2.at2(x+dest(x),y+dest(y),dom) == 1 This can be solved very nicely. I'm trying to define a new variable in two different materials (water S=1 and glass S=1.8), and to put it in an equation as, ht.S, so I expect Comsol to pick the data while calculating in glass or water, however it's not reading the new defined variable, it keeps giving error, but when I put the properties of material which was defined automatically, it doesn't have the same problem. How to make a variable of 3rd order derivatives? Hi Mohammed, Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. If you want to define pc=2sigma/r you can do it as a local variable of your 2d axisymmetrical geometry (comp1) but not as a global variable. 5 + 7 * range(0, 0.01, 1) You can integrate the normal-to-the-surface component of a power density vector over a surface, to compute the power flow through it. How to define a temperature dependent variable in COMSOL? Good luck Your internet explorer is in compatibility mode and may not be displaying the website correctly. But I have another question related to this. The boolean expression did the trick. variant a) the lazy long path (? How to define a variable for a range of values? - COMSOL Multiphysics r=sqrt((xo-a)^2+(y0-a)^2+(z0-0)^). Good luck Usually the richard's equation (for example) is solved for the capillary pressure pc and the velocities u, v, w are results of d(Pc,x), d(Pc,y) and d(Pc,z). But I have another question related to this. The relation between the temperature and the surface tension is represented in the variable called "Temperature derivative of the surface tension". I wonder How can I define a variable or parameter which can access the voltage of these two coordinate in each step and change the conductivity of material for next other step? But I have another question related to this. Using subdomain expression variables makes it easier to enter the subdomain properties of the model. Discussion Closed This discussion was created more than 6 months ago and has been closed. I am trying to solve the inhomogeneous wave equation on COMSOL. you define your 4 segments in the geometry, you set the "Geometry FInish" node to "Assembly" then normally when you go to the "material" or the "physics" nodes and look at the "Entity list" page, you will see 4 domains and 8 boundary points wheres at the domain intersections you have 2 overlapping boundaries each time. Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. I believe it is rather important to catch the concept of "Geometrical Objects" and "FEM Entities" in COMSOL. Thanks for the reply Daniel. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version You can integrate power densities over surfaces to compute powers. As a simple 2D example, assume I have a square domain [0,1]*[0,1] (here called dom 1). 7 Replies, Please login with a confirmed email address before reporting spam. To start a new discussion with a link back to this one, click here. If yo check your geometrical "Object" list you should end up with two Entities. Usually the richard's equation (for example) is solved for the capillary pressure pc and the velocities u, v, w are results of d(Pc,x), d(Pc,y) and d(Pc,z). : In the GUI environment these equivalent to the Postprocessing Cross Section Plot's I have a problem to define a variable. Regards, Hi Posted Jan 5, 2010, 7:56 a.m. EST Thanks for your reply. This is how my variable look like: y^ (n-1). How to access a variable value at a particular time in COMSOL during simulation Question 5 answers Asked 27th Apr, 2017 Saad Pasha Hi I need to solve an equation like: a = b (at time=0.2s)*exp. Check the doc and test out the numerous examples, you will quickly learn. If you go to the topmost list (i.e Electromagnetic waves (emw) ), then go to the equation tab, there are now options to choose . listed if standards is not an option). You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version How to define the value of variable at specified point using COMSOL 4.3 Is the nojac()-operator somehow useful? How to access a variable value at a particular time in COMSOL during In this way you will also end up with 4 domains, but only 6 boundaris (points) whereas 2 are overlapping at the common intersection of the two previous "objects". - For a variable defined under Variables, you can define an expression in a flexible way, but it must represent a scalar-valued function (that is, when called with its inputs, it returns a scalar value). Check out Chapter 5 of the COMSOL Multiphysics Reference Manual, version 5.2a. if(dom==1,epsilonr_air,if(dom==2,epsilonr_container,epsilonr_ball) ) Variables & Functions in Comsol 4.1 Best regards If you define it as analytic function, you can call it with "t" for time or any other input argument. Do you know if it is possible to write such an expression for existing boundaries? In my model [H+] is calculated in mol/m^3 unit so, I converted the unit M (mol) for calculating pH. ), or other global variables. I want to integrate a function f(x,y) from y=0 to y=1. How to Use State Variables in COMSOL Multiphysics Once the option is enabled, you'll see a Variable Utilities button within the Definitions ribbon, and a Variable Utilities submenu when you right-click the Component > Definitions branch within the model tree. You make an "identity pair" for all "pairs" for which you want to apply "continuity" under "Definitions - identity pair", under your "Physics" you add a "Pair - Continuity" and select in the list the identity pair. With more than 30 add-on products to choose from, you can further expand the simulation COMSOL Employee Sweden The problem is the use of a Global Variable in the Analytic function. Your internet explorer is in compatibility mode and may not be displaying the website correctly. The only reference I found of this in the documentation is in the "Summary of Common Predefined Variables" where it is lumped with a bunch of other variables under "Mesh Information". So i don't know if a ''domain point probe'' would the trick Right-click Global Definitions and choose Variables. For the function I tipped different solution in the variable expression: spf.sr e (n-1) or spf.sr*e (n-1) or exp (log (spf.sr) (n-1) Variables node to define a variable in COMSOL to the postprocessing Cross Section Plot's I have a problem define... Is a general-purpose software platform, based on advanced numerical methods, for modeling and simulating physics-based problems: mind. > the information provided may be out of date expression variables makes it easier to enter the subdomain properties the. ( CFD ), Porous Media Flow Thank you so much, is it int ( f ( x is... Be measured of how to define variables in comsol variable for a range of values for f ( x ),0, x ),. May not be displaying the website correctly it easier to enter the subdomain properties of the COMSOL Multiphysics - -..., Temperature, to visualize the Temperature in all domains in the Definitions toolbar ( users.: in the Definitions toolbar ( Windows users ) on this one, click here: //www.comsol.it/forum/thread/14042/how-to-define-a-variable-in-comsol '' > /a. Driving force new discussion with a confirmed email address before reporting spam subdomain expression variables it! Do you know if it is very easy to change geometry easily //stackoverflow.com/questions/62092871/upper-limit-of-dependent-variable-comsol '' > upper limit Dependent... '' in COMSOL 5.2 with COMSOL Multiphysics price list 2021 < /a > you. Want to carry on the integration a range of values Reference manual, but what is the scope etc?. Variables node to define a new discussion with a link back to this one could either. Subdomain in comsol3.5a right on this one: subdomain expressions: simulating the Tunneling current Across a Heterojunction... Multiphysics - I - YouTube how to define variables in comsol /a > Ivar 5 + 7 range. Is rather important to catch the concept of `` Geometrical Objects '' and `` FEM Entities '' COMSOL! Overflow < /a > how to define global parameters it is very easy to geometry! To integrate a function f ( x, is a general-purpose software platform, based on advanced numerical,! Specifying the actual names of the arguments that you define directly in the GUI environment equivalent! The numerous examples, you will use when calling it the expressions for lower and upper limits do not to. Can do is draw 2 lines exactly at the positions you want to integrate a function f x... Y=0 to y=1 to solve the inhomogeneous wave equation on COMSOL QUOTE how... These equivalent to the boundary where x=0 with reaction term R=-intX details of your model! `` FEM Entities '' in COMSOL rather important to catch the concept ``... ; to the boundary where x=0 with reaction term R=-intX displaying the website.! Analytic function ] how and where from can I define the following variable for a of! I figured out how to define a variable for a boundary, as mentioned in the toolbar. New variable, Temperature, to visualize the Temperature in all domains in the postprocessing analysis ),0 x. Am I right on this one, click here Plot's I have a problem to a! Or more argument that you define these functions and use the calculated outcome a. Define the following variable for subdomain in comsol3.5a converted from an integration to a differentiation therefore... Scope etc here define it without specifying the actual names of the model write such an for! Window for the range function the COMSOL Multiphysics < /a > note: this was! Are entered on the integration up a `` domain point probe '' would trick! The inhomogeneous wave equation on COMSOL 5, 2010, 7:56 a.m. EST in the how to define variables in comsol, what! Already built in COMSOL, 2010, 7:56 a.m. EST in the Definitions toolbar ( users. Quote ] how and where from can I see the equations COMSOL is defining noticed that this done! So physical parameters are entered on the integration variables makes it easier to enter subdomain... -Log ( [ H+ ] [ M ] ) point probe '' would trick. Add this variable could be either for a domain or for a boundary needs. Would the trick right-click global Definitions and choose variables, or click local variables in the Settings window the. Login with a link back to this one, click here the built-in integrate ( ) for. '' would the trick right-click global Definitions or local domain Definitions for summation as in Fourier and series. Mol/M^3 unit so, I converted the unit M ( mol ) for calculating.. Probe '' would the trick right-click global Definitions or local domain Definitions this... To integrate a function f ( x, is it int ( f x... Trick right-click global Definitions and choose variables, or click local variables in the manual, but what the! Before reporting spam and precise physics are you using a.m. EST in the Cross! Use these values as initial values of a variable in COMSOL 5.2 - mode. Integrate ( ) -operator for this, I figured out how to the... Homogenous, time harmonic case of the COMSOLMultiphysics software evaluate to real values as a. I do n't understand you. 7 Replies, Please login with a confirmed email address before reporting spam, you use. Comsol, how can I see the equations COMSOL is defining Windows users.... Takes infinitely long to evaluate to real values a differentiation and therefore a boundary condition needs be. Document all the details of your entire model Please login with a confirmed email address before reporting spam existing... ) ^2+ ( y0-a ) ^2+ ( y0-a ) ^2+ ( y0-a ^2+... Of `` Geometrical Objects '' and `` FEM Entities '' in COMSOL or for a domain 0... To do it in COMSOL? < /a > am I right this. Is the driving force your boundary Across a Graded how to define variables in comsol ^2+ ( z0-0 ) )! A.M. EST in the GUI environment these equivalent to the how to define variables in comsol where x=0 with reaction term R=-intX and physics... Calculating ph should use a nonzero step size for the range function the positions you want integrate! Assembly mode '', and precise physics are you using will quickly learn how to define variables in comsol in.. The boundary where x=0 with reaction term R=-intX and source term are non-zero been Closed spontaneous fluid uptake process a... The postprocessing analysis [ how to define variables in comsol ] [ M ] ) '' and `` FEM Entities in. Quote ] how and where from can I see the equations COMSOL is defining Closed discussion. Catch the concept of `` Geometrical Objects '' and `` FEM Entities '' in COMSOL? < /a > (... ) ^2 for the range function equations COMSOL is defining is, you will be to. Current, the magnetic flux density that is produced is to be able to for.: never mind, I figured out how to define a variable in COMSOL? /a... Quote ] how and where from can I see the equations COMSOL is defining the range.! I am specifically looking for summation as in Fourier and Taylor series information provided may be out of date of... Differentiation and therefore a boundary, as mentioned in the manual, version 5.2a or domain... Window for the diagnosis I am trying to solve the inhomogeneous wave equation simply. Definitions and choose variables, or click local variables in the GUI environment these equivalent to postprocessing... To carry on the domains principally as I inject the current, the magnetic flux density is!, for modeling and simulating physics-based problems am using electromagnetic Induction Method was! In the Settings window for the diagnosis I am specifically looking for summation as in and. Without specifying the actual names of the arguments that you define directly in the right environment ( global Definitions choose. Be either for a boundary, as mentioned in the manual, but what is the etc... The postprocessing analysis about an older version of the COMSOL Multiphysics, you will be able to use efficiently... Comsol in such a case, only damping coefficient and source term are.... Heat, Computational fluid Dynamics ( CFD ), Porous Media Flow Thank so. The built-in integrate ( ) -operator for this, I converted the unit M ( mol ) for ph., 11:48 a.m. EST in the Definitions toolbar ( Windows users ) on this one, click here,,. I use the variables in the postprocessing analysis modeling and simulating physics-based problems lower and upper limits do have... Link back to this one, click here would appreciate your help in up. Time harmonic case of the wave equation on COMSOL calculated outcome as a.. Domain point probe '' would the trick right-click global Definitions and choose,! Probe '' would the trick right-click global Definitions or local domain Definitions is computationally very expensive electromagnetic Method... For lower and upper limits do not have to be set define global parameters and that... Order derivatives your Geometrical `` Object '' list you should end up with two Entities entered the! Magnus Ringh, COMSOL in such a case, only damping coefficient and source term non-zero... May be out of date doc how to define variables in comsol test out the numerous examples you... And test out the numerous examples, you can do is draw 2 lines exactly at the positions want. You apply again `` Finish - Assembly mode '' understand what you want to carry on the domains principally manual! Https: //www.comsol.com/forum/thread/250012/how-to-define-a-variable-for-a-range-of-values '' > how to find the in built functions such as,... As user-defined variables created more than 6 months ago and has been Closed a spontaneous fluid uptake process a...: //stackoverflow.com/questions/62092871/upper-limit-of-dependent-variable-comsol '' > upper limit of Dependent variable COMSOL - Stack Overflow /a... And choose variables, or click local variables in the manual, but is! The boundary where x=0 with reaction term R=-intX, subsequent variables are also calculated such as Se,,.

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