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Luis Batista March 24, 2013 19:47

Creating a tool to interpolate results
Dear Users,

I am developing a function to interpolate results between nodal results points for an incompressible, laminar, 2D flow.

I am aware that there are some built-in function inside OpenFoam to do this by sampleDict but I would need to implement a 9 node interpolation polynomial.

I can write an external subroutine to read the results and find the interpolated results, however, I has wondering if:

1- Can I add write an interpolation routine inside OpenFoam and add it to sampleDict in order that I can call it through the command-line sample.

2- In the case 1) is possible, I need to solve a small linear system for U and p. I have a couple of them programmed in Fortran and I could reprogram them in C++, however, isn't it possible to use the linear matrix solvers from OpenFoam? If so, how can this be achieved?

3- Which procedures do I have available to access the results from the solver in order that I can manipulate the results?

note: I am a beginner in OpenFoam, if you take the patience to answer, please mind that:)

Best regards,
Luis Batista

RPS April 6, 2013 01:06

Hi Luis,

I had implemented a new interpolation technique for FEM calculations for force and moments in a simulation software. Depending on how far your node sets are the error in interpolation will vary. Let me know if you are interested in it.

Raghunandan Patthar

Luis Batista April 11, 2013 08:15


I will try to express better my needs.

I have built in FORTRAN an interpolation tool that carries out operations in the result files (p.e. Ux, Uy, pressure).

I would like to write this interpolation tool in c++ and use it as an "interporlation scheme", that I can use in other OpenFoam operations, as per example, for sampling data for plotting throught sample.

I believe this should be possible but I would like to hear from more experienced people if this is wise to do.


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