MATLAB for Contour Plots of OpenFOAM Data

Bodo1993 · October 26, 2020, 12:10

Hi, I use the file 'surfaces' to extract 2D surfaces of the phase fraction from OpenFOAM transient results. I postprocess the data using MATLAB to plot contours of the phase fraction and make videos. I am wondering if I have to use the interpolation function 'griddata' to do so. The problem with 'griddata' is that it takes time to do the interpolation, e.g. a simulation with 100 time steps may take more than an hour to generate the video. Any suggestions?

hulli · October 27, 2020, 10:16

Hi you can try to modify the code of the medical imaging toolbox (matlab file exchange) to read your vtk files into matlab ...

hulli · October 27, 2020, 10:18

so you do not need to griddata actually it gives you the same as you would get from paraview ...

Bodo1993 · October 27, 2020, 10:39

Hi, thank you. I will try that. Just to make sure, is the exact name of the toolbox "Medical Image Processing Toolbox"?

hulli · October 28, 2020, 03:52

Hi, yes
what I did was I produced slices slicing my model using the surfaces /sample Dict function. Then I imported the vtk file using the function read_vtkMesh of the toolkit ...
https://de.mathworks.com/matlabcentr...essing-toolbox
Notice if you run it it will complain about some missing functions which you have to download, then you should be fine... using

patch or trimesh you can visulaize the grid...
I had to do some adjistments to visulaize the field since I was not able to read the fields ... However, I can DM you my script if you want ... Best H

Bodo1993 · October 28, 2020, 09:57

Quote:

Originally Posted by hulli

Hi, yes
what I did was I produced slices slicing my model using the surfaces /sample Dict function. Then I imported the vtk file using the function read_vtkMesh of the toolkit ...
https://de.mathworks.com/matlabcentr...essing-toolbox
Notice if you run it it will complain about some missing functions which you have to download, then you should be fine... using

patch or trimesh you can visulaize the grid...
I had to do some adjistments to visulaize the field since I was not able to read the fields ... However, I can DM you my script if you want ... Best H

Hi, thanks a lot. That would be great.

Edgar Alejandro Martínez · September 11, 2021, 15:50

Here I have a file to extract 2D results of the wake of a virtual turbine:
https://github.com/EdgarAMO/fluidfoam

Video on YT:
https://www.youtube.com/watch?v=wFZeFDUQflQ

October 26, 2020, 12:10	MATLAB for Contour Plots of OpenFOAM Data	#1
Bodo1993 Senior Member Join Date: Jul 2019 Posts: 148 Rep Power: 6	Hi, I use the file 'surfaces' to extract 2D surfaces of the phase fraction from OpenFOAM transient results. I postprocess the data using MATLAB to plot contours of the phase fraction and make videos. I am wondering if I have to use the interpolation function 'griddata' to do so. The problem with 'griddata' is that it takes time to do the interpolation, e.g. a simulation with 100 time steps may take more than an hour to generate the video. Any suggestions?

September 11, 2021, 15:50	Use Python insted	#7
Edgar Alejandro Martínez New Member Edgar Alejandro Martínez Ojeda Join Date: Jul 2019 Posts: 20 Rep Power: 6	Here I have a file to extract 2D results of the wake of a virtual turbine: https://github.com/EdgarAMO/fluidfoam Video on YT: https://www.youtube.com/watch?v=wFZeFDUQflQ

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October 27, 2020, 10:16		#2
hulli Member hulli graemer Join Date: Oct 2014 Posts: 48 Rep Power: 11	Hi you can try to modify the code of the medical imaging toolbox (matlab file exchange) to read your vtk files into matlab ...

October 27, 2020, 10:18		#3
hulli Member hulli graemer Join Date: Oct 2014 Posts: 48 Rep Power: 11	so you do not need to griddata actually it gives you the same as you would get from paraview ...

October 27, 2020, 10:39		#4
Bodo1993 Senior Member Join Date: Jul 2019 Posts: 148 Rep Power: 6	Hi, thank you. I will try that. Just to make sure, is the exact name of the toolbox "Medical Image Processing Toolbox"?

October 28, 2020, 03:52		#5
hulli Member hulli graemer Join Date: Oct 2014 Posts: 48 Rep Power: 11	Hi, yes what I did was I produced slices slicing my model using the surfaces /sample Dict function. Then I imported the vtk file using the function read_vtkMesh of the toolkit ... https://de.mathworks.com/matlabcentr...essing-toolbox Notice if you run it it will complain about some missing functions which you have to download, then you should be fine... using patch or trimesh you can visulaize the grid... I had to do some adjistments to visulaize the field since I was not able to read the fields ... However, I can DM you my script if you want ... Best H