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Ravi Kumar


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University of Illinois

152 total contributions since 2016

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Answered
Adaptive mesh refinement function for time-dependent problems?
Adaptive refinement of time-dependent problem is not currently available in PDE Toolbox. However, you can do a coarse adaptive...

10 days ago | 0

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Answered
PDE Toolbox: evaluateGradient for legacy workflow or convert legacy solution to PDE solution
Hi Maxime, You can create a result object of the kind you need using the solution from the legacy solver and the createPDEResu...

10 days ago | 1

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Answered
How can I just get the corner points in the 3D model?(PDE Toolbox)
Hi Haoran, It looks like you are interested in nodes that form the triangle element corners and not the midside nodes. Two opt...

10 days ago | 1

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Answered
PDETool temperature gradient-dependent internal heat generation
Hi Tadeu, My apologies, this is a bug in detecting pseudo-nonlinearity. Solver does not pass solution and its derivative to cus...

10 days ago | 0

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Answered
Solution dependent material coefficient? How to use specifyCoefficients in pdetool (for a time dependnet PDE solution)
Define a function or a anonymous function handle as per the prescribed format. For example you can define: cFcn = @(region,stat...

12 days ago | 0

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Answered
partial derivative coding in matlab
Although I have not looked into details, you might be able to setup this problem using pdepe function available in base MATLAB (...

15 days ago | 0

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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. ...

15 days ago | 0

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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. ...

16 days ago | 0

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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...

23 days 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...

24 days 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 ...

29 days ago | 0

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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...

1 month ago | 0

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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...

1 month ago | 0

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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...

1 month 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...

1 month ago | 0

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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...

1 month ago | 0

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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...

1 month ago | 0

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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 ...

2 months 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...

2 months 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 months 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 months ago | 0

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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 months ago | 0

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

2 months 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...

2 months 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? ...

2 months 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...

2 months ago | 0

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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 ...

2 months ago | 0

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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 months ago | 0

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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 months ago | 0

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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 months ago | 0

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