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Ravi Kumar


University of Illinois

127 total contributions since 2016

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Ravi Kumar's Badges

  • 12 Month Streak
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  • Knowledgeable Level 3
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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...

15 hours ago | 0

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 ...

1 day ago | 0

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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...

5 days 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...

5 days 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...

19 days ago | 0

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Time dependent external heat flux in PDE Toolbox
Hi Pascal, You are on the right track, refer to the externalHeatFlux in the example: https://www.mathworks.com/help/pde/ug/h...

20 days ago | 0

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Answered
Unexpected Result for 3-D Thermal Transient Analysis of Heat sink using PDE Solver Toolbox
Here is the correct results using the new STL after fixing two more inconsitencies: Radiation problem should include temperatu...

22 days ago | 1

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Answered
Unexpected Result for 3-D Thermal Transient Analysis of Heat sink using PDE Solver Toolbox
Hello Jake, You seem to have unit mismatch in the MATLAB model. PDE Toolbox doesn't have any units. When you exported the geom...

23 days ago | 1

Answered
Solving 2D Convection Diffusion Equation
You might be able to setup the 2-D version using PDE toolbox. Take look at the following code. Please verify I have accuratly ca...

26 days ago | 0

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Answered
Solving PDE for Hygromechanical Coupling with f coefficient as a function of previous PDE results
You should be all set if you replace the last two lines in your function with the following one line: fx = [gradx.'.*coefRGx;gr...

2 months ago | 0

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Answered
Error using deval in pde toolbox
Hi SS, The warning: Warning: Failure at t=1.307250e+00. Unable to meet integration tolerances without reducing the step size...

3 months ago | 0

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Answered
Temperature-dependent boundary conditions
Do you have PDE Toolbox in your installed products list? You can check this by executing 'ver' at the command prompt. If so, di...

3 months ago | 0

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Answered
Radiation in PDE thermal model
To activate both radiation and convection on the same boundary, combine them into one assignment as: thermalBC(thermalmodel,'Fa...

3 months ago | 0

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Answered
Temperature in a specific point with pde thermal
Yes! Check out the interpolateTemperature function.

3 months ago | 0

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How to specify initial conditions for two different subdomains in PDE solver?
I suggest you to look at the programmatic workflow, refer to the programmatic workflow overview doc page. In the programmatic ...

3 months ago | 0

Answered
How to specify f coefficient function for arbitrarily located point sources within a domain.
If you want to use addtional arguments in computing f, then wrap the f coefficient function around the actual function that take...

3 months ago | 0

Answered
Determine locations struct used in PDE solver
You can write that code that you indented to use to "create a matrix that is of length N by M where ..." in the function itself....

3 months ago | 0

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Answered
Time-dependent thermal conductivity
Function should return values of k at all points requested by the solver, points are in the first argument. Update your funciton...

3 months ago | 0

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Answered
Import of a 2D mesh created by Mesh2D or NodeLab into PDE Toolbox
You can import triangles in 2-D into PDE Toolbox using geometryFromMesh function. Although it creates geometry using the mesh da...

5 months ago | 0

Answered
Usage of InternalHeatSource from PDE toolbox (Heat Transfer)
Value of internal hear source should be energy per unit volume. Are you sure your internalHeatSource command is getting executed...

5 months ago | 0

Answered
Time-dependent internal heat source
You cannot add function handle as you have done, f+q in: specifyCoefficients(model,'m',0,'d',d,'c',c,'a',a,'f',f+q); I would r...

5 months ago | 0

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Answered
How I introduce a matrix form of c coefficient in PDE equation using solvepde matlab command
Output of c coefficient function should be a matrix or column vector of appropriate size, where the number of columns correspond...

5 months ago | 0

Answered
Efficient sensor placement optimization
Not sure if I understand your question correctly. Are you referring to location mesh nodes when you say sensor? My guess is you...

5 months ago | 0

Answered
Heat transfer question in pde toolbox
Yes, all the three properties can be defined as function of temperature. This will make the problem highly nonlinear, existance ...

6 months ago | 0

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How can I resolve the error "PDE coefficients cannot be function of solution or time." in a static solution of a PDE.
What are the output arguments in you function call InterpolateDisplacement? [UVdispB, UVdispT, UVdispL, UVdispR]=InterpolateDis...

6 months ago | 0

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How to create a copy of a pde model ?
Get hold of the handle that is provided as output, like: bc = applyBoundaryCondition(....) Now you can...

6 months ago | 0

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How to apply the boundary conditons to the mass and stiffness matrices?
Use the 'nullspace' as second argument, you will get matrices with BC imposed by eleminating dirichlet DoFs. Regards, Ravi

6 months ago | 0

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Answered
Cannot apply multiple, region-dependent thermal properties in PDE Toolbox
This is a bug where solver fails to distinguish the functions as seperate based on some queries. Workaround is to define variati...

6 months ago | 1

Answered
How squareg works ?
Hi Pavel, I don't fully understand your question, but I can answer a portion on how to create square of different size. You can...

6 months ago | 0

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Answered
PDE tool box, internal heat generation and BC conditions
If the problem is axisymmetric, then you need follow the approach similar to this example: https://www.mathworks.com/help/pde/...

7 months ago | 0

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