Community Profile

photo

Ravi Kumar


Last seen: 2 days ago

University of Illinois

193 total contributions since 2016

Contact

Ravi Kumar's Badges

  • 12 Month Streak
  • Solver
  • Knowledgeable Level 3
  • Revival Level 1
  • First Answer

View details...

Contributions in
View by

Answered
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...

12 days ago | 0

Answered
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 ...

15 days ago | 0

| accepted

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

19 days ago | 0

Answered
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...

19 days ago | 0

Answered
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...

22 days ago | 0

| accepted

Answered
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...

2 months ago | 0

| accepted

Answered
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...

2 months ago | 0

Answered
PDE TOOLBOOX heat transfer error
You are overwriting modelc immediately after creating the thermal model. Remove the second line: modelc = createpde

2 months ago | 0

| accepted

Answered
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

2 months ago | 0

Answered
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...

3 months ago | 0

Answered
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 ...

3 months ago | 0

Answered
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...

3 months ago | 0

Answered
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...

4 months ago | 1

| accepted

Answered
How can I extend the functionality of PDE tool box
Hi Jammi, You might want to explore the generic equation based workflow that solves the equations that can be cast into the sup...

4 months ago | 1

Answered
I can't use "structuralProperties" in PDE toolbox
Change the line: thePde = createpde(); to thePde = createpde('structural'); By default, createpde returns a model that has...

4 months ago | 0

| accepted

Answered
Plotting points from a 3D model onto a 2D graph
You can interpolate the temperatures at (x,y) coorinates over time and plot them. Refer to interpolateTemperatue function. Rega...

4 months ago | 0

| accepted

Answered
Interpolation of the results from the PDE toolbox and the spatial differentiation of the solution
You can do this using interpolateSolution and evaluateGradients. Regards, Ravi

4 months ago | 1

| accepted

Answered
Obtain the strain from the model analysis solution
Strain is in response to a applied loading. Modal analysis is a eigenvalue problem. So you won't be able to calculate strain fro...

5 months ago | 0

Answered
Applying boundary conditions to a circle
Hi Alun, You are applying your BCs on interior edges, these are not boundaries. Please refer to this page: https://www.mathwo...

5 months ago | 0

| accepted

Answered
How to update the PDE toolbox with the real measurement?
You can specify the displacement as a function, look at the the end of the the structualBC doc page. However, note that PDE Tool...

6 months ago | 0

| accepted

Answered
PDE Toolbox producing inconsistent solutions
Hi Atdhe, Here is a quick fix, tighten the tolerance, this will force ODE solver to take finer steps. Insert the following bef...

6 months ago | 0

| accepted

Answered
PDE magnetostatic electromagnet how to measure the magnetic field.
Hi Bastiaan, It might be easier if you do a 2-D approximate analysis. For 3-D, modeling the air around the coil to solve for m...

6 months ago | 0

Answered
Change color pdegplot/ gradient
One workaround would be switch the order of plots: figure() pdegplot(model,'FaceLabels','off','EdgeLabels','off','VertexLabels...

7 months ago | 0

| accepted

Answered
Transient Neumann boundary condition
You should be able to apply the Neumann BC using the power calculation that you have done in the beginning. But be sure to take ...

7 months ago | 0

Answered
Problem with coefficient c in function form in solving 2D-PDE (PDE toolbox)
Hi Chiara, Solver will call the function several times to check if it is returing the correct format of coeff and so on, for th...

7 months ago | 0

| accepted

Answered
why does using the Partial Differential Equation (PDE) Toolbox, I get the following error: PDEModel does not have a mesh?
Please use pdegplot, if you want to plot geometry. pdegplot(model,'FaceLabels','on')

7 months ago | 0

Answered
3D PDE modelling different c coefficients for different spatial regions
Hi Barnaby, If all you want is different values of c for points within sphere and outside sphere, then you can just do this: ...

8 months ago | 0

| accepted

Answered
Radiation and convection in thermal models with different ambient and sink temperatures
To pass additional parameter, wrap the functions that actually computes with the ones you specify as inputs. In your example: ....

8 months ago | 0

| accepted

Answered
Error: Function specifying a coefficient must accept two input arguments and return one output argument (PDE Toolbox).
Chage f = zeros(N,nr3); to f = zeros(15,nr3); N is not in the scope of the function fcoeffunction. Regards, Ravi

8 months ago | 0

| accepted

Answered
solving eigenvalues PDE problem
Hi Haya, You need to setup the problem using new workflow: model = createdpde; Then assign the geometry to the model using d...

8 months ago | 0

| accepted

Load more