OpenFOAM to ParaView (+1)
OpenFOAM to ParaView
# Create .foam trigger file for ParaView
touch /path/to/case/case.foam
# Launch ParaView visualization
pvbatch visualize.py
# visualize.py — Automated ParaView post-processing
from paraview.simple import *
def openfoam_post_process(case_dir, output_dir):
"""Generate standard CFD visualization outputs."""
import os
os.makedirs(output_dir, exist_ok=True)
# Load OpenFOAM case
foam_file = os.path.join(case_dir, 'case.foam')
if not os.path.exists(foam_file):
open(foam_file, 'w').close()
reader = OpenFOAMReader(FileName=foam_file)
reader.MeshRegions = ['internalMesh']
reader.CellArrays = ['U', 'p']
# Last time step
anim = GetAnimationScene()
anim.UpdateAnimationUsingDataTimeSteps()
anim.AnimationTime = reader.TimestepValues[-1]
view = GetActiveViewOrCreate('RenderView')
view.ViewSize = [1920, 1080]
# Velocity magnitude slice
calc = Calculator(Input=reader)
calc.Function = 'mag(U)'
calc.ResultArrayName = 'Umag'
slice_z = Slice(Input=calc)
slice_z.SliceType.Normal = [0, 0, 1]
display = Show(slice_z, view)
ColorBy(display, ('POINTS', 'Umag'))
display.SetScalarBarVisibility(view, True)
view.ResetCamera()
Render()
SaveScreenshot(os.path.join(output_dir, 'velocity_slice.png'), view)
# Pressure iso-surface
Hide(slice_z, view)
contour = Contour(Input=reader)
contour.ContourBy = ['POINTS', 'p']
contour.Isosurfaces = [0]
display2 = Show(contour, view)
Render()
SaveScreenshot(os.path.join(output_dir, 'pressure_iso.png'), view)
# Export line probe data (e.g., centerline)
probe = PlotOverLine(Input=reader)
probe.Point1 = [0, 0, 0]
probe.Point2 = [1, 0, 0]
probe.Resolution = 200
SaveData(os.path.join(output_dir, 'centerline_data.csv'), proxy=probe)
OpenFOAM to Blender (Presentation Rendering)
# 1. Export from OpenFOAM to VTK
foamToVTK -case /path/to/case -latestTime
# 2. Convert VTK to STL via ParaView script (pvbatch does not support -c flag)
cat > vtk_to_stl.py << 'PYEOF'
from paraview.simple import *
r = LegacyVTKReader(FileNames=['VTK/case_1000.vtk'])
s = ExtractSurface(Input=r)
t = Triangulate(Input=s)
SaveData('surface.stl', proxy=t)
PYEOF
pvbatch vtk_to_stl.py
# 3. Import into Blender
blender --background --python render_cfd.py -- --input surface.stl --output render.png
vamseeachanta