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# Ravi Kumar

### University of Illinois

174 total contributions since 2016

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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...

12 dagen ago | 0

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...

18 dagen 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...

22 dagen ago | 0

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

28 dagen ago | 0

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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 ...

ongeveer een maand ago | 0

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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...

ongeveer een maand 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')

ongeveer een maand ago | 0

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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: ...

ongeveer 2 maanden ago | 0

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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: ....

2 maanden 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

2 maanden 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...

3 maanden 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...

3 maanden ago | 1

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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...

3 maanden 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...

3 maanden 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...

3 maanden 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...

3 maanden ago | 0

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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,...

3 maanden 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,...

3 maanden ago | 1

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Answered
Colour Jet figure plot - how to view exact value?
If you got the solution, displ, u, and v by setting up and solving the PDEs in PDE Toolbox, then you would be able to use interp...

3 maanden ago | 0

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Magnetic Potential in PDE Modeler
Good you find your way to setup magnetic potential. PDE Toolbox is unit free. You need to setup the problem by specifying all q...

3 maanden ago | 0

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Mass Transfer - Forced Convection Boundary Condition
Your Neumann BC approach is the right option. But be aware that you can only model mass diffusion within domain, forced convecti...

3 maanden ago | 0

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Answered
Is it possible apply moving load (constant force with a speed) when using the PDE ToolBox?
Yes, you can do so using a functional form of load. Say you are applying pressure on a face; you can define a function of pressu...

3 maanden ago | 0

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...

4 maanden 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...

4 maanden 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...

4 maanden 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...

4 maanden 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...

4 maanden 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 (...

4 maanden 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. ...

4 maanden ago | 0

Answered
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. ...

4 maanden ago | 0

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