Answered
Capacitance by solving Poisson equation
If you setup the problem using PDE Toolbox, look here for example, then you get the gradients of the solution in the results. ...

2 years ago | 0

Answered
How to properly add radiative heat flux boundary conditions in a stationary heat transfer problem using the pde toolbox?
Hi Eduardo, The issue is with the default tolerance. The default tolerance of 1E-4 in the model is too loose for your problem. ...

2 years ago | 0

| accepted

Answered
How i can write transient condition in a pde thermal model?
Example: If you want to write y^2 - 2*t^2, you write: handlename=@(region,state) region.y.^2 - 2 * state.time^2 Yes, if it de...

2 years ago | 0

Answered
How can I solve 2D transient diffusion equation with nonlinear source term?
I don't see any interaction between species being defined by the stated PDEs. You can define coefficients usng PDEModel workflo...

2 years ago | 0

Answered
questions about the 'pdeeig'
Please use one the newer workflow like general equation based one, Structural or Thermal one. Once you setup your model in one ...

2 years ago | 0

| accepted

Answered
Haw can I use the PDE toolbox to model isotropic thermal expansion?
The latest version of MATLAB has the capabality to solve for thermal expansion and thermal stress by specifying temperature as a...

2 years ago | 0

| accepted

Answered
capability pde toolbox, 3d application heat transfer
If your 3-D model that you discretize involve only cubes then you can model this in PDE. For example see attached image: Yo...

2 years ago | 1

| accepted

Answered
Defining non-constant Neumann Boundary Conditon
You do not need to model the interface BC explicitly. This condition should be automatically satisfied in the solution. Regard...

2 years ago | 0

Answered
PDE Toolbox - Convection in Diffusion Equation
It looks like your function errored without returning one onput. Most likely the error could have been due to 'va' being out of...

2 years ago | 0

| accepted

Answered
How to integrate PDE solution in 2D space?
If you are solving a single PDE, i.e., you used createpde(1) then you need to specify time-steps as the last argument. If you ha...

2 years ago | 0

| accepted

Answered
How to set boundary conditions?
If you are using PDE Toolbox, then you have to create all those edges, and then you would be able to do it. Refer to the documen...

2 years ago | 0

| accepted

Answered
3D Multi-Domain PDE Modelling
Thanks for taking time to explain the problem with such a detail and for providing the reproduction code. I tried to understand ...

2 years ago | 2

| accepted

Answered
How to plot DiscreteGeometry objects
Looks like you are overwriting the plot in a loop. If you want to plot multiple figures then you insert: figure command before p...

2 years ago | 0

Answered
Error While exporting data to workspace.
You can export solution by selecting menu option: Solve> Export Solution This would export the solution as 'u' variable to wor...

2 years ago | 0

Answered
Use of "region" and "state" in PDE models with variable coefficients.
Hi Allen, Solver passes two input arguments to the function that you define, "region" and "state" are just place holder names....

2 years ago | 0

| accepted

Answered
Import a 2D STL File
Hi Matthias, Your geometry in the STL file is indeed 3-D. I am assuming you want just the one of the flat faces for two 2-D an...

2 years ago | 0

| accepted

Answered
Import a 2D STL File
The keyword here is "planar". Is your geomtry planar? Regards, Ravi

3 years ago | 0

Answered
Thermal simulation with Nodal Temperature Initial Condition
Couple of options: You can use a function to define the temperature, which you can specify to thermalIC as function_handle. Y...

3 years ago | 0

Answered
PDE toolbox and load on nodes
OK, in that case can you number the number of verteices in the model: >> gm Do you see the new VertexID in the plot you make? ...

3 years ago | 0

Answered
PDE toolbox and load on nodes
The function addVertex was introduced in R2019b. You might be running an older version of the MATLAB to get this error. Regard...

3 years ago | 0

| accepted

Answered
PDE Toolbox: Constant external heating on 4 sides of a Cylinder
Hi Pascal, If there is no axial variation, then I suggest using a 2-D crosssecion to solve the problem. In 2-D you can easily ...

3 years ago | 0

| accepted

Answered
EvaluateHeatRate Matlab PDE units and discussion
evaluateHeatRate returns the value of heat flux integrated our the specified face. So its unit would be unit of enery, if everyt...

3 years ago | 0

| accepted

Answered
How can I modify the default options (like RelTol' and 'AbsTol') of the pde solver when using the PDE toolbox?
You can edit those tolerances directly using the model object properties. Say, model = createpde(... User model the set RelTo...

3 years ago | 0

| accepted

Answered
Question on using geometryFromMesh
It looks like the node IDs from COMSOL might be 0 based. That is first node ID in COMSOL may be 0, in MATLAB it must be 1. You c...

3 years ago | 1

| accepted

Answered
Time dependent external heat flux in PDE Toolbox
Hi Pascal, You are on the right track, refer to the externalHeatFlux in the example: https://www.mathworks.com/help/pde/ug/h...

3 years ago | 0

| accepted

Answered
Unexpected Result for 3-D Thermal Transient Analysis of Heat sink using PDE Solver Toolbox
Here is the correct results using the new STL after fixing two more inconsitencies: Radiation problem should include temperatu...

3 years ago | 1

| accepted

Answered
Unexpected Result for 3-D Thermal Transient Analysis of Heat sink using PDE Solver Toolbox
Hello Jake, You seem to have unit mismatch in the MATLAB model. PDE Toolbox doesn't have any units. When you exported the geom...

3 years ago | 1

Answered
Solving 2D Convection Diffusion Equation
You might be able to setup the 2-D version using PDE toolbox. Take look at the following code. Please verify I have accuratly ca...

3 years ago | 0

| accepted

Answered
Solving PDE for Hygromechanical Coupling with f coefficient as a function of previous PDE results
You should be all set if you replace the last two lines in your function with the following one line: fx = [gradx.'.*coefRGx;gr...

3 years ago | 0

| accepted

Answered
Error using deval in pde toolbox
Hi SS, The warning: Warning: Failure at t=1.307250e+00. Unable to meet integration tolerances without reducing the step size...

3 years ago | 0

| accepted

Load more