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Ravi Kumar


University of Illinois

98 total contributions since 2016

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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/...

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 ...

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...

5 Tage ago | 0

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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...

11 Tage ago | 0

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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...

11 Tage ago | 0

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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...

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...

16 Tage ago | 0

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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

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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 ...

23 Tage ago | 0

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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. ...

etwa 2 Monate ago | 0

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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

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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...

etwa 2 Monate 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, ...

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...

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...

2 Monate 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?

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...

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...

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...

3 Monate 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(...

4 Monate 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...

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 ...

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...

5 Monate 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.

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...

5 Monate 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.

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...

6 Monate 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 = ...

6 Monate 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.

6 Monate ago | 0

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