Reducing 3D data to 2D by integrating over one dimension
I have a cylinder with a temperature distribution. I would like to average the data circumferentially and apply the resultant field into a 2D axisymmetric version of the same cylinder. What would be...
View ArticleProblems computing the volume change of a domain
Hello, I'm modelling a pressurized sphere within an elastic domain, in 2D axi-symmetric Structural Mechanics (v4.2). I'm trying to check the volume change of the sphere. There are analytic solutions...
View ArticleGeneral integration operator?
I am looking to take an input variable, n, and do an integration function, but NOT an integration over volume/area/boundary. Specifically I am looking to solve the Fermi-Dirac integral and use the...
View ArticleAttributes for each region, integration over region
Greetings, I am new to Comsol and tried to see if a similar discussion has been carried out before without luck. I have a magnetostatic model with several regions (windings). I need to connect...
View ArticleCurrent Density
Can anyone tell me, why the currenty density is quoted in A and not in A/m^2? I have a sphere with several layers. Each is made of different material. After I've computed the electric currents, I...
View ArticleTime integration in comsol 3.5a
Hi everyone, I am just wondering if there is a time integration function in comsol 3.5a. I am calculating fluid flow rate through a boundary and which is a function of time and I would like to...
View ArticleIntegration boundary condition that is probably of circular dependency...
I tried to model the ionic exchange in a dye-sensitized solar cell. The concentration of cations in the electrolyte follows a Boltzmann distribution: Nc = N0 * exp(-Q/kT). N0 is a constant. That is, Nc...
View ArticleFlow rate integration over a period
Hello, I am using 2D to model periodic flow through an open boundary with zero normal stress. I have added an integral over the surface of this boundary, as well as a global probe that reads "intop1(u)...
View ArticleIntegration of a function
Hello, I am having trouble integrating a function over a surface for which I have solved variable p . The integration I want to solve is f(x,y) = int (p * f2(x,y,x',y') dx' dy'. The problem I have...
View ArticleBoundary conditions in terms of integrated forces and moments
Hello, I am interested in simulating with COMSOL (version 4.2a) the following (I think) simple and rather academic elasticity problem. Let us consider a cylindrical rod (3D system with axis along Z),...
View ArticleIntegration domains with Join datasets
I am calculating electrostatics in 3D using Comsol 4.4. Using the same geometry and the same mesh, I create two different solutions, "es" and "es2", with different boundary conditions. I want to plot...
View ArticleAn Integral problem
Hi, I have a function f(p,T) defined on a 3D subdomain x=0..a, y=0..b and z=0..c. I want to calculate at each point (x,y,z) the Integral I1: I1(x,y,z)=int_0^z f(p,T) dz' where p is a x,y dependent...
View ArticleTunneling through barrier
I want to simulate tunneling through voltage (energy) barrier of electrons. In order to evaluate the tunneling probability by WKB approximation, I need to use the voltage distribution over the device...
View ArticleIntegrating over a portion of a 3D domain?
Is it possible to integrate over a portion of a 3D domain? I can easily integrate over a whole domain, but if I want a small section of a domain, is there an easy way to do this? I'm working with the...
View ArticleIntegrate Series of Cut Planes
I want to integrate a series of xy cut planes in a 3D model. I have been doing this manually changing z each time: z=0,100,200,300....Ideally I would like finer increments and a more automated way to...
View ArticleSimple integration with limits
Hi All, I have a linear projection(located along the y-axis) giving the heat loss/unit length for a simple rectangular channel located on the same axis. I simply want to integrate along this linear...
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