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 ...

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 ...

1 day 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...

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 days ago | 0

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...

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...

3 days ago | 0

| 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...

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...

3 days 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...

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...

4 days 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...

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...

9 days 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...

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...

10 days ago | 0

| accepted

Answered

3D Magnetostatics in the Presence of a Current Source via PDE Toolbox

Thanks for taking time to explain the problem with such a detail and for providing the reproduction code. I tried to understand ...

3D Magnetostatics in the Presence of a Current Source via PDE Toolbox

Thanks for taking time to explain the problem with such a detail and for providing the reproduction code. I tried to understand ...

18 days ago | 1

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...

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...

20 days 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...

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...

20 days 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....

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....

22 days 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...

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...

23 days ago | 0

| accepted

Answered

Import a 2D STL File

The keyword here is "planar". Is your geomtry planar? Regards, Ravi

Import a 2D STL File

The keyword here is "planar". Is your geomtry planar? Regards, Ravi

1 month 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...

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...

1 month 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? ...

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? ...

1 month 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...

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...

2 months 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 ...

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 ...

2 months 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...

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...

2 months 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...

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...

2 months 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...

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...

2 months ago | 0

| 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...

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...

2 months 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...

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...

2 months 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...

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...

2 months 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...

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...

2 months 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...

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 months 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...

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...

4 months ago | 0

| accepted

Answered

Temperature-dependent boundary conditions

Do you have PDE Toolbox in your installed products list? You can check this by executing 'ver' at the command prompt. If so, di...

Temperature-dependent boundary conditions

Do you have PDE Toolbox in your installed products list? You can check this by executing 'ver' at the command prompt. If so, di...

4 months ago | 0

| accepted

Answered

Radiation in PDE thermal model

To activate both radiation and convection on the same boundary, combine them into one assignment as: thermalBC(thermalmodel,'Fa...

Radiation in PDE thermal model

To activate both radiation and convection on the same boundary, combine them into one assignment as: thermalBC(thermalmodel,'Fa...

5 months ago | 0

| accepted

Answered

Temperature in a specific point with pde thermal

Yes! Check out the interpolateTemperature function.

Temperature in a specific point with pde thermal

Yes! Check out the interpolateTemperature function.

5 months ago | 0

Answered

How to specify initial conditions for two different subdomains in PDE solver?

I suggest you to look at the programmatic workflow, refer to the programmatic workflow overview doc page. In the programmatic ...

How to specify initial conditions for two different subdomains in PDE solver?

I suggest you to look at the programmatic workflow, refer to the programmatic workflow overview doc page. In the programmatic ...

5 months ago | 0