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Ravi Kumar


University of Illinois

88 total contributions since 2016

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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. ...

13 days 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...

13 days ago | 0

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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...

16 days ago | 0

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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, ...

23 days 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...

24 days 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...

1 month ago | 0

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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?

1 month 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...

1 month 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...

2 months 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...

2 months ago | 0

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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(...

2 months ago | 1

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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...

3 months 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 ...

3 months 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...

3 months ago | 0

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Control mesh size on the faces of a 3D Structural Model
Local mesh refinement is currently not availbale in PDE Toolbox.

3 months 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...

4 months ago | 0

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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.

4 months ago | 0

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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...

5 months ago | 0

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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 = ...

5 months ago | 1

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Answered
Does the importgeometry command work to import any geometry in simmechanics ?
Currently only STL import is supported in importGeometry.

5 months ago | 0

Answered
Is it possible to export stresses computed with the PDE Modeler App?
I would suggest using the programmatic workflow instead of PDEModeler, where you get direct access to solution and its derived q...

5 months ago | 1

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Answered
PDE modeler plotting method
You can export solution from Solve dropdown menu. You will have the solution for all time-steps as variable 'u' in your workspac...

5 months ago | 0

Answered
What does deflection mean in Structural Mechanics PDE Toolbox?
a) Results output from PDE Toolbox contains Displacements wstruct array ith ux, uy, and uz as fields, these values are displace...

5 months ago | 0

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Answered
Time-dependent boundary condition in PDE Toolbox
Hi Alexis, Replace the BC assignment line: Tgauche = applyBoundaryCondition(pdem,'Edge',4, 'u', sin(350*t).^2); with mybc =...

5 months ago | 1

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Answered
Stationary Convection-Diffusion Equation 2-D
Hi Andrea, I suggest using <https://www.mathworks.com/help/pde/ug/solve-problems-using-pdemodel-objects.html programmatic> w...

6 months ago | 0

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Answered
About PDETOOL in 3-D
Use programmatic workflow for 3-D problems. An outline of the programmatic workflow is shown in the <https://www.mathworks.com/h...

6 months ago | 0

Answered
thermal conductivity, pde toolbox
Hi Juan, Looks like you have orthotropic thermal conductivity, not spatially varying conductivity. in that case, you can jus...

6 months ago | 0

Answered
thermal conductivity, pde toolbox
Hi Juan, I recommend using the new <https://www.mathworks.com/help/pde/heat-transfer-and-diffusion-equations.html ThermalMod...

6 months ago | 0

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Answered
Set a noncontinous 2d heat source in PDE toolbox
As the message indicates, the function should take 2 input arguments (which your function does, no problem here). However, your ...

7 months ago | 0

Answered
PDE toolbox and non-constant coefficients
Hello Flo, Your understanding of the function_handle and c-coefficient are correct. The state.u is the value of the solution...

7 months ago | 1

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