Cavitation around a bullet
Update: July 1, 2017
OpenFOAM 4.x
Case directory
$FOAM_TUTORIALS/multiphase/interPhaseChangeFoam/cavitatingBullet
Summary
We calculate the cavitation (bubbles that form and disappear due to pressure differences) around a bullet moving through water at 20 m/s for 0.05 seconds.
Model
The fluid flows in from the region "inlet" at (0, 0, 20) m/s and out from the region "outlet". The bullet surface is assumed to be no-slip, and the side walls of the analysis region are assumed to be symmetric.
The meshes are as follows, and the number of mesh is 711261.
Meshes (on YZ-plane)
Meshes (on YZ-plane, zoomed)
The calculation result is as follows.
Volume ratio of water (alpha.water)
Flow velocity at final time (U)
Pressure at final time (p_rgh)
Volume ratio of water at final time (alpha.water)
Commands
cp -r $FOAM_TUTORIALS/multiphase/interPhaseChangeFoam/cavitatingBullet cavitatingBullet
cd cavitatingBullet
cp $FOAM_TUTORIALS/resources/geometry/bullet.stl.gz constant/triSurface/
blockMesh
snappyHexMesh -overwrite
cp -r 0.orig 0
potentialFoam -pName p_rgh
interPhaseChangeFoam
paraFoam
Calculation time
- Making meshes: 1 minutes 12.04 seconds
- Calculating: 2 hours 59 minutes 30.25 seconds
*Single, Core(TM) i7-2600 CPU @ 3.40GHz 3.40GHz