# Ravi Kumar

### University of Illinois

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**Feeds**

Stacked Cuboid for PDE Domain

Our geometry expert provided a much compact version to create this geometry: g=fegeometry(multicuboid([1 2],[1 2],2)) g2=extru...

2 månader ago | 0

Stacked Cuboid for PDE Domain

Here is an example, use this code and modify the dimensions. % Define the first square of size 1 x1 = [0; 1; 1; 0]; % x-coord...

2 månader ago | 0

| accepted

How to set state.u state.t in PDE Toolbox's function assmbleFEMatrixes for a generic 2D problem?

https://www.mathworks.com/help/pde/ug/assemblefematrices.html#mw_c59ea87b-8f13-478a-b33d-351795b1572f

5 månader ago | 1

Why does my imported geometry show only 1 face & 1 edge?

Hi Muhammad, As Cris noted, the lack of sharp edges in the triangulation results in a single face for the whole geometry. He...

10 månader ago | 0

| accepted

parfor-loop leads to wrong results of PDE solver

Hi Anselm, This is a bug when the model gets transferred to the worker in the process of parfor execution. I apologize for the ...

mer än 2 år ago | 1

| accepted

How to define coefficient c in 3 coupling pdes in solving 2D-PDE (PDE toolbox)

If you have Symbolic Math Toolbox, then you can use the pdeCoefficients function to get the requried c-coefficient. Regards, ...

mer än 2 år ago | 0

| accepted

Why do I get zero Thermal Stress? Am I using the PDE Toolbox incorrectly?

Got it. You don't have CTE specified along with the material properties. Refer to structuralProperties() call in the bi-metal ex...

mer än 2 år ago | 0

| accepted

Using XY Data from this example? Help please

You can use interpolateStress to find values of stress at a given query coordinates (xq,yq,zq),. Regards, Ravi

nästan 3 år ago | 2

| accepted

Can someone help me with this Matlab code on 2D heat equation

Your T_initial is declared as a scalar, you are getting the error when you try to index into it beyond its size. Make that zeros...

ungefär 3 år ago | 1

| accepted

Pressure units for a 1D edge on a structural model?

When you are solving a 2-D structural probelm (either plane stress or plane strain approximation), unit thickness is implicit. C...

ungefär 3 år ago | 0

Improve efficiency of AssembleFEMatrices?

If you are using R2020b or newer version of MATLAB, you should be able to specify required matrices as input: https://www.mathw...

ungefär 3 år ago | 0

| accepted

How to give initial guess and initial condition for a nonlinear - time dependent PDE problem (transient non-linear heat equation) in pde tool box?

For nonlinear elliptic problem, inputs in setInitialCcnditions is the initial guess for the nonlinear solver. For time-dependent...

ungefär 3 år ago | 0

| accepted

How to get AssembleFEMatrices for a nonlinear and Time dependent PDE problem in PDEtool box

Solution matrix must of of the size NumPDEs x NumNodes. In your case, you are providing several solutions at all the time-steps ...

ungefär 3 år ago | 0

Display generated mesh/ call out adjacent nodes in 3D domain

Check findNodes function. You should be able to specify region as box in which you need node IDs. Regards, Ravi

ungefär 3 år ago | 0

How to mesh mutliple objects?

This example might work for you!

ungefär 3 år ago | 0

| accepted

Unable to resolve the name results.NodalSolution.

You have a typo. It should be u=result.NodalSolution; not u=results.NodalSolution; Regards, Ravi

ungefär 3 år ago | 0

| accepted

PDE: modal analysis two bodies - possible?

Hi Rober, Your mass density seems to be off. If you are using SI units, as it appears from Young's moduls, mass density must b...

mer än 3 år ago | 1

| accepted

PDE toolbox, specifying coefficients, error telling me "Function specifying a coefficient must accept two input arguments and return one output argument."

The function "fcoeffunction", does not have definitions of e, L, C, mu, r, o, etc. in its scope. Move the definitions in the beg...

mer än 3 år ago | 0

Issue with STL geometry and pde toolbox

Check the dimensions of the expoerted geometry. Some tools export by default in mm, you mght be seeing many more frequenceis if ...

mer än 3 år ago | 0

| accepted

Thermal contact resistance in PDE toolbox

Hi Luca, Interface conditions like thermal contact resistance are not yet supported in PDE Toolbox. Regards, Ravi

mer än 3 år ago | 0

Set non-constant boundary condition proportional to solution at that point and time

Hi Ollie, The function you have written does exactly what you describe. What is the issue you are encountering? Regards, Ra...

mer än 3 år ago | 0

| accepted

Transient thermal model (PDE Toolbox) failing to solve due to time dependent heat flux and ambient temperature. "Unable to meet integration tolerance."

Hi Kevin, Make sure your geometry from STL is in SI units too as you have properties specified in SI units. I don't see anythi...

mer än 3 år ago | 0

| accepted

Transient heat flux boundary condition in PDE toolbox

Based on what you describe, it appears you are assigning heat flux on an interior edge. These are not boundaries of the domain s...

mer än 3 år ago | 0

| accepted

PDE Toolbox FEA Units

Hello Colton, You are right, PDE Toolbox does not have any units. Two things you can check again: You save E as 10300000 psi i...

mer än 3 år ago | 0

PDE TOOLBOOX heat transfer error

You are overwriting modelc immediately after creating the thermal model. Remove the second line: modelc = createpde

mer än 3 år ago | 0

| accepted

Can I use the figure’Blade.stl’ file provided in PDE Toolbox for publication (copyright)?

Please contact Customer Support here: https://www.mathworks.com/support/contact_us.html Regards, Ravi

mer än 3 år ago | 0

Interpolating at centroid of a tetrahedral mesh

You can use interpolateSolution if you are using equation based interfaces to setup the problem. If you are solving a structural...

mer än 3 år ago | 0

Radiation heat transfer using PDE toolbox

Hi Ruben, Thanks for the code, it helped. All the BCs inside RadandConv == 1 block are applied on the edges that are interior ...

mer än 3 år ago | 0

Finite Element Analysis in Matlab with user-defined elements?

You can define user defined functions of space, time, and solution using PDE Toolbox generic workflow, check out the following l...

mer än 3 år ago | 0

Boundary Condition for 3-D Poisson's Equation using PDE Toolbox

You need BC for all three equations. You might want to try u as [0;0;0] or other appropriate vector of 3 rows, where each row co...

mer än 3 år ago | 1

| accepted