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Ravi Kumar


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University of Illinois

186 total contributions since 2016

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  • 12 Month Streak
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  • Knowledgeable Level 3
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Answered
PDE TOOLBOOX heat transfer error
You are overwriting modelc immediately after creating the thermal model. Remove the second line: modelc = createpde

9 dagar ago | 0

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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

10 dagar 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...

18 dagar ago | 0

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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 ...

28 dagar 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...

28 dagar 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...

ungefär 2 månader ago | 1

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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...

ungefär 2 månader 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...

2 månader ago | 0

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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...

2 månader ago | 0

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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

2 månader ago | 1

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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...

2 månader 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...

3 månader ago | 0

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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...

4 månader ago | 0

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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...

4 månader ago | 0

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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...

4 månader ago | 0

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

5 månader ago | 0

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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 ...

5 månader 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...

5 månader ago | 0

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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')

5 månader 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: ...

6 månader ago | 0

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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: ....

6 månader ago | 0

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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

6 månader ago | 0

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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...

6 månader ago | 0

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Answered
Defining internalHeatSource based on changing temperature?
Solver passes the value of solution and its derivatives in state struct array (state.u, state.ux, etc.) You can use this data in...

6 månader ago | 1

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Answered
Applying fixed temperature to face in 2D thermal simulation?
Hi Lisa, In 2-D, faces are part of domain. If you apply fixed temperature on a face, then that is the solution, no? If it is a...

6 månader ago | 0

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Answered
Export pde solution out of matlab
Hi Lalson, Solution is availble as a matrix in NodalSolution property of the result object obtained using solvepde. You may ne...

7 månader ago | 0

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Answered
PDEtoolbox_Error using daeic3 (line 230) Need a better guess y0 for consistent initial conditions.
You do have a singula mass matrix becuase of the equation 2. If I understand correctly equation 1 can be solved in isolation. On...

7 månader ago | 0

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Answered
internalHeatSource for cylindrical geometry
Having an axisymmetric analsysis, which is not supported yet, would simplify your setup.Here is an alternative approach which mi...

7 månader ago | 0

Answered
Defining a geometry to apply Heat flux - PDEPE Toolbox
Exactly as in the example you pointed to, in which you will find: thermalBC(thermalmodel,'Face',4,'HeatFlux',@externalHeatFlux,...

7 månader ago | 0

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Answered
Additional Inputs PDE Toolbox f coefficient
Change to: specifyCoefficients(model,'m',0,'d',0,'c',c_coeff,'a',0,'f',f_fun,'Cell',1); Remove the @ symbol in front of f_fun,...

7 månader ago | 1

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