[General] Calculate the volume of each cell in ParaView

reza2031 · October 12, 2022, 14:22

Here is the issue:
I do not know how to calculate the cell volumes as a field in ParaView.

What do I need it for:
A RANS simulation is necessary prior to an LES simulation.
One can calculate the integral length scale from a RANS simulation and use it to see if the mesh is fine enough.
In my case, I did a k- $\omega$ simulation. Then, calculated the integral length scale L as a field in ParaView:
L = $\frac{k^{0.5}}{C_{\mu}^{0.25}*\omega}$ ,where $C_{\mu}$ is equal to 0.09
One can define a new field f:
f = $\frac{L}{\Delta}$ ,where L is the integral length scale and $\Delta$ is $Cell Volume^{(1/3)}$

Let us say the goal is to resolve 80% of eddies, then f < 5 shows where the mesh is coarse and needs refinement.

But, I do not know how to get the volume for each cell.

Any help is appreciated,
Reza

reza2031 · October 12, 2022, 18:23

For anyone having the same issue.
Here is how to calculate the cell volumes in ParaView.
You can use the "Mesh Quality" filter.
You can press Ctrl+Space and then type in "Mesh Quality", then press Enter.
Depending on your mesh (Tet, Hex, or ...), select the quality measure.
My mesh has only the "Hex" type.
See attachments.

Cheers!
Reza

MMRC · November 16, 2023, 11:18

Hi Reza, I found this also could work:

1) using topoSet and foamToVTK extract as vtm series the region of interest

2) import it into paraview and apply filter cell size
3) open spreadsheet and check both Cell Data and Field Data info. The first one shows volume per cell, the last one shows the total volume of the vtm series.

October 12, 2022, 14:22	Calculate the volume of each cell in ParaView	#1
reza2031 New Member Reza Nouri Join Date: Oct 2012 Location: Tennessee Posts: 26 Rep Power: 14	Here is the issue: I do not know how to calculate the cell volumes as a field in ParaView. What do I need it for: A RANS simulation is necessary prior to an LES simulation. One can calculate the integral length scale from a RANS simulation and use it to see if the mesh is fine enough. In my case, I did a k- $\omega$ simulation. Then, calculated the integral length scale L as a field in ParaView: L = $\frac{k^{0.5}}{C_{\mu}^{0.25}*\omega}$ ,where $C_{\mu}$ is equal to 0.09 One can define a new field f: f = $\frac{L}{\Delta}$ ,where L is the integral length scale and $\Delta$ is $Cell Volume^{(1/3)}$ Let us say the goal is to resolve 80% of eddies, then f < 5 shows where the mesh is coarse and needs refinement. But, I do not know how to get the volume for each cell. Any help is appreciated, Reza

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November 16, 2023, 11:18		#3
MMRC Member María Rosales Join Date: Mar 2023 Location: Spain Posts: 48 Rep Power: 3	Hi Reza, I found this also could work: 1) using topoSet and foamToVTK extract as vtm series the region of interest 2) import it into paraview and apply filter cell size 3) open spreadsheet and check both Cell Data and Field Data info. The first one shows volume per cell, the last one shows the total volume of the vtm series.