paraview extracts lift, drag, and pressure clouds.

ProjectPhysX / FluidX3D

The fastest and most memory efficient lattice Boltzmann CFD software, running on all GPUs via OpenCL. Free for non-commercial use.

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paraview extracts lift, drag, and pressure clouds. #173

Closed wjsjtu123 closed 6 months ago

wjsjtu123 commented 6 months ago

I extracted the rho and u data in vtk format with two commands lbm.rho.write_device_to_vtk(); and lbm.u.write_device_to_vtk();. In paraview, I want to get a visual cloud of pressure, lift and drag from these two data, how do I do it.

ProjectPhysX commented 6 months ago

Hi @wjsjtu123,

pressure is proportional to density, in LBM units: Δp = (rho-rho0)*c^2 = (rho-1)/3

you can get the pressure delta in SI units with

const float si_delta_p_n = units.si_p((lbm.rho[n]-1.0f)/3.0f);

there is no way yet to export pressure directly to .vtk, you can only export density and convert to pressure manually
to get the forces, you first have to export the force field to .vtk:
```
lbm.calculate_force_on_boundaries();
lbm.F.write_device_to_vtk();
```

Kind regards, Moritz