Answered

PDE tool box, internal heat generation and BC conditions

If the problem is axisymmetric, then you need follow the approach similar to this example: https://www.mathworks.com/help/pde/...

PDE tool box, internal heat generation and BC conditions

If the problem is axisymmetric, then you need follow the approach similar to this example: https://www.mathworks.com/help/pde/...

4 Tage ago | 0

Answered

How can i define PDE coefficient which is scalar matrix inside the boundary

Hi Kim, Is your ffunc depends on solution, i.e., using state.u? Can you provide sample data, also xv and yv? Regards, Ravi ...

How can i define PDE coefficient which is scalar matrix inside the boundary

Hi Kim, Is your ffunc depends on solution, i.e., using state.u? Can you provide sample data, also xv and yv? Regards, Ravi ...

4 Tage ago | 0

Answered

Boundary condition for multidomain geometry

Hi Urban, Would you be able to share your code and data? Geometric faces are identified by analyzing how drastic the normal ch...

Boundary condition for multidomain geometry

Hi Urban, Would you be able to share your code and data? Geometric faces are identified by analyzing how drastic the normal ch...

5 Tage ago | 0

Answered

Retrieving indices of times for a time-dependent system of PDEs within applyBoundaryCondition()

You need to create an interpolant object, see for example, griddedInterpolant. Construct interpolant (may be one for each N), an...

Retrieving indices of times for a time-dependent system of PDEs within applyBoundaryCondition()

You need to create an interpolant object, see for example, griddedInterpolant. Construct interpolant (may be one for each N), an...

11 Tage ago | 0

Answered

PDE Toolbox does not recognize subdomains in imported .stl geometry

STL with multiple bodies are imported as separate cells in PDE Toolbox. Essentially, the two cells are disconnected for analysis...

PDE Toolbox does not recognize subdomains in imported .stl geometry

STL with multiple bodies are imported as separate cells in PDE Toolbox. Essentially, the two cells are disconnected for analysis...

11 Tage ago | 0

| accepted

Answered

I find that the matlab official example "deflection-of-a-piezoelectric-actuator" cannot be correct

Hello Prof. Ciavarella, Can you provide a bit more details, reproduction code and expected results, of the modified setup to i...

I find that the matlab official example "deflection-of-a-piezoelectric-actuator" cannot be correct

Hello Prof. Ciavarella, Can you provide a bit more details, reproduction code and expected results, of the modified setup to i...

11 Tage ago | 0

| accepted

Answered

What is the best way to fit parameters in the pdesolver to a set of datapoints?

You might need to use Optimization Toolbox in conjunction with PDE Toolbox to setup the objective function and constraints. Woul...

What is the best way to fit parameters in the pdesolver to a set of datapoints?

You might need to use Optimization Toolbox in conjunction with PDE Toolbox to setup the objective function and constraints. Woul...

12 Tage ago | 0

Answered

plese help me solve this

You can use PDE Toolbox to solve this kind of heat transfer problem. Refer to the documentation on Heat Transfer problem setup i...

plese help me solve this

You can use PDE Toolbox to solve this kind of heat transfer problem. Refer to the documentation on Heat Transfer problem setup i...

16 Tage ago | 0

Answered

How to change from dirichlet to newman conditions in a thermal model using PDE?

Hi Rubem, ThermalModel crated using thermalmodelS=createpde('thermal') lets you set up the problem in deomain specific funct...

How to change from dirichlet to newman conditions in a thermal model using PDE?

Hi Rubem, ThermalModel crated using thermalmodelS=createpde('thermal') lets you set up the problem in deomain specific funct...

23 Tage ago | 1

| accepted

Answered

evaluateGradient missing from pde toolbox

Hi Heidi, You need to have a results object in the workspace to access evaliuateGradient on the MATLAB path. Run any PDEModel ...

evaluateGradient missing from pde toolbox

Hi Heidi, You need to have a results object in the workspace to access evaliuateGradient on the MATLAB path. Run any PDEModel ...

23 Tage ago | 0

| accepted

Answered

pde themral model, thermally connect two cells

Hi Derek, Multidomains in the imported geometry, using STL file, are not recoganized as connected cells of the same geometry. ...

pde themral model, thermally connect two cells

Hi Derek, Multidomains in the imported geometry, using STL file, are not recoganized as connected cells of the same geometry. ...

etwa 2 Monate ago | 0

Answered

Simple compression of cylinder- results of finite element model don't make sense

Hi Clay, Your BCs are correct. I think the load you are applying is resulting in very small defomration. This is causing the d...

Simple compression of cylinder- results of finite element model don't make sense

Hi Clay, Your BCs are correct. I think the load you are applying is resulting in very small defomration. This is causing the d...

etwa 2 Monate ago | 0

| accepted

Answered

error in heat transfer example

Hi Charlie, What version of MATLAB are you running R2018a or R2018b. In any case, you should not see this error if you run t...

error in heat transfer example

Hi Charlie, What version of MATLAB are you running R2018a or R2018b. In any case, you should not see this error if you run t...

etwa 2 Monate ago | 0

| accepted

Answered

PDE Toolbox: Using different temperature-dependent thermal conductivities

I did not realize this in my initial response, both of your k values goes to inf when u=0. Try the following following instead, ...

PDE Toolbox: Using different temperature-dependent thermal conductivities

I did not realize this in my initial response, both of your k values goes to inf when u=0. Try the following following instead, ...

etwa 2 Monate ago | 0

Answered

PDE Toolbox: Using different temperature-dependent thermal conductivities

Both k1 and k2 yields zero when state.u = 0, this is causing solver to misinterpret them as same functions. You can get around t...

PDE Toolbox: Using different temperature-dependent thermal conductivities

Both k1 and k2 yields zero when state.u = 0, this is causing solver to misinterpret them as same functions. You can get around t...

etwa 2 Monate ago | 0

Answered

nonzero m and d coefficients for Matlab PDE

Refer to this documentation: https://www.mathworks.com/help/pde/ug/pde.pdemodel.specifycoefficients.html#bu7pwf5 d has to be a...

nonzero m and d coefficients for Matlab PDE

Refer to this documentation: https://www.mathworks.com/help/pde/ug/pde.pdemodel.specifycoefficients.html#bu7pwf5 d has to be a...

2 Monate ago | 0

| accepted

Answered

How to indicate the number of nodes and elements of mesh of PDE problem in command line? (the function pdeplot can't do this)

Try using: pdemesh(modelM,'NodeLabels','on') Does it not show labels of node for you?

How to indicate the number of nodes and elements of mesh of PDE problem in command line? (the function pdeplot can't do this)

Try using: pdemesh(modelM,'NodeLabels','on') Does it not show labels of node for you?

2 Monate ago | 0

Answered

PDE Thermal model computation speed

Hi Juan, Nonconstant BC would take longer than constant BC. However, the increase you are observing seems abnormal, given that...

PDE Thermal model computation speed

Hi Juan, Nonconstant BC would take longer than constant BC. However, the increase you are observing seems abnormal, given that...

3 Monate ago | 0

Answered

How to incorporate a 3D mesh in [p,e,t] format on a PDE thermal model?

You can attempt to use geometryFromMesh function to import geometry as a mesh (also retain the original mesh). Regards, Ra...

How to incorporate a 3D mesh in [p,e,t] format on a PDE thermal model?

You can attempt to use geometryFromMesh function to import geometry as a mesh (also retain the original mesh). Regards, Ra...

3 Monate ago | 0

Answered

How to apply external heat flux to a surface with specified "emissivity" boundary conditions in MATLAB R2018 PDE Toolbox?

You can specify all heat fluxes on that BC with a single function call, like: thermalBC(thermalmodelT,'Edge',2,'HeatFlux',@So...

How to apply external heat flux to a surface with specified "emissivity" boundary conditions in MATLAB R2018 PDE Toolbox?

You can specify all heat fluxes on that BC with a single function call, like: thermalBC(thermalmodelT,'Edge',2,'HeatFlux',@So...

3 Monate ago | 0

| accepted

Answered

How to impose a variable temperature distribution for one edge of a rectangular plate while keeping the temperatures of other three edges same and constant?

Hi Anik, Define a function to model variation of temperature and use it in BC specification: tFunc = @(region,state) 30.*sin(...

How to impose a variable temperature distribution for one edge of a rectangular plate while keeping the temperatures of other three edges same and constant?

Hi Anik, Define a function to model variation of temperature and use it in BC specification: tFunc = @(region,state) 30.*sin(...

4 Monate ago | 1

| accepted

Answered

Assigning faces or cells fro meshes created by distmesh

Hello Lewis, To get multiple subdomains into PDE Toolbox you need to use the four argument format of the geometryFromMesh. Lik...

Assigning faces or cells fro meshes created by distmesh

Hello Lewis, To get multiple subdomains into PDE Toolbox you need to use the four argument format of the geometryFromMesh. Lik...

4 Monate ago | 0

Answered

Compute Craig Bampton model reduction using structural PDE toolbox

Hi Alberto, I see have asked this question a while ago, hope it is still relevant to you. Could you elaborate your use case a ...

Compute Craig Bampton model reduction using structural PDE toolbox

Hi Alberto, I see have asked this question a while ago, hope it is still relevant to you. Could you elaborate your use case a ...

4 Monate ago | 0

Answered

How to export things from pdetool?

You can export gometry related information from pdetool from the 'Draw' menu, last option. You might also consider other geomet...

How to export things from pdetool?

You can export gometry related information from pdetool from the 'Draw' menu, last option. You might also consider other geomet...

5 Monate ago | 0

Answered

Control mesh size on the faces of a 3D Structural Model

Local mesh refinement is currently not availbale in PDE Toolbox.

Control mesh size on the faces of a 3D Structural Model

Local mesh refinement is currently not availbale in PDE Toolbox.

5 Monate ago | 0

Answered

How to extract data from a stress displacement graph generated by pdeplot3d?

Use the function interpolateStress. For example, in your case you could do: intrpStress = interpolateStress(structuralresults,0...

How to extract data from a stress displacement graph generated by pdeplot3d?

Use the function interpolateStress. For example, in your case you could do: intrpStress = interpolateStress(structuralresults,0...

5 Monate ago | 0

| accepted

Answered

Is it possible to calculate the reaction forces in a PDEModel if i use enforced displacement as load?

You can evaluate reaction at the boundary using evaluateReaction function.

Is it possible to calculate the reaction forces in a PDEModel if i use enforced displacement as load?

You can evaluate reaction at the boundary using evaluateReaction function.

6 Monate ago | 0

Answered

What is wrong about my "specifyCoefficients" function use for PDEModel?

Can you try using: specifyCoefficients(model,'m',0,'d',d_mod,'c',c_mod,'a',0,'f',f_mod); and see if you get the solution? Reg...

What is wrong about my "specifyCoefficients" function use for PDEModel?

Can you try using: specifyCoefficients(model,'m',0,'d',d_mod,'c',c_mod,'a',0,'f',f_mod); and see if you get the solution? Reg...

6 Monate ago | 0

| accepted

Answered

it's possible to update nodes value in a mesh that was created with pde toolbox?

Hello Gabriel, You can achieve this using geometryFromMesh function. Following your example: results = solvepde(model); u = ...

it's possible to update nodes value in a mesh that was created with pde toolbox?

Hello Gabriel, You can achieve this using geometryFromMesh function. Following your example: results = solvepde(model); u = ...

6 Monate ago | 1

| accepted

Answered

Does the importgeometry command work to import any geometry in simmechanics ?

Currently only STL import is supported in importGeometry.

Does the importgeometry command work to import any geometry in simmechanics ?

Currently only STL import is supported in importGeometry.

6 Monate ago | 0