Post processing tools

[julieng]

Hello,

Is there any macros or patches to calculate for example the mass flow rate ?
How do you proceed ?

Sorry but i have very few experience with openfoam

Best regards

[thschrader]

In paraview, use filters "slice" and "integrate variables".
In this case, Ux represents the volume-flow at the slice.
Multiplied by the fluid density you get the mass-flow through the slice.
But if you have an incompressible fluid, the mass flow at every slice at the channel
must be the same, so you can calculate the mass flow from your inlet parameters.

volume_flow.JPG (157 KiB) Viewed 542 times

[julieng]

Thank you thschrader,

Ok I have test it, is a simple and good solution for incompressible flow.
I try to compute a compressible flow case but I have some error.

Is the volumic mass data available in Paraview for compressible mass flows calculation?



Best regards

Julien

[thschrader]

I try to compute a compressible flow case but I have some error.

Can you post your FC-file?
It is hard to guess a solution...

[julieng]

I have the following error



My case is joined

Best regards

Julien

[thschrader]

My case is joined

You are using the His solver for pipe flow with 0,5 m/s inlet speed.
Hisa was developed for external high speed aerodynamics.
http://hisa.gitlab.io/

However, at inlet/outlet use the far-field boundary. Here are some examples:

falcon9.FCStd

(51.47 KiB) Downloaded 14 times

bullet.FCStd

(17.81 KiB) Downloaded 15 times

https://forum.freecadweb.org/viewtopic. ... 1&start=10
Bedtime...

[julieng]

Hello

Do you know how to plot the drag and lift forces on function of time with paraview?

I do the same steps extract surface, generate normals, calculate pressure x normal x Rho.

If i try integrate variable and plot other time i have nothing in my graph.

Best regards

[thschrader]

Hello
Do you know how to plot the drag and lift forces on function of time with paraview?
I do the same steps extract surface, generate normals, calculate pressure x normal x Rho.
If i try integrate variable and plot other time i have nothing in my graph.
Best regards

Not from scratch. I will have a look at it.
When generating surface normals, dont forget to enable "compute cell normals".
After integrating the variables, switch from point data to cell data in List.
Thomas

[julieng]

Hello thschrader,

I have done "compute cell normals" and also choose cell data in the integration list.

Best regards