Backstep flow

Update: December 17, 2018
OpenFOAM 4.x

Case directory

$FOAM_TUTORIALS/compressible/rhoPimpleFoam/les/pitzDaily

Summary

The fluid flows in from the region "inlet" at (10, 0, 0) m/s and out from the region "outlet". No-slip condition is set for the walls of the flow channel, and the problem is 2-dimensional with a single mesh in the Z-direction. LES (one equation eddy viscosity model) is used for turbulence calculation.

Model geometry Model geometry

The meshes are as follows.

Mesh Meshes

The fieldAverage function is used to output the time averaged pressure and flow velocity as pMean and UMean for each time. These settings are made in system/controlDict.

The calculation result is as follows.

Flow velocity (U)
Flow velocity (U) Flow velocity (U)
Pressure (p) Pressure (p)
Time-averaged flow velocity at the final time (UMean) Time-averaged flow velocity at the final time (UMean)
Time-averaged pressure at the final time (pMean) Time-averaged pressure at the final time (pMean)

Commands

cp -r $FOAM_TUTORIALS/compressible/rhoPimpleFoam/les/pitzDaily pitzDaily
cd pitzDaily

blockMesh
rhoPimpleFoam

# 3D visualization
paraFoam

Calculation time

18 minutes 37.58 seconds *Single, Inter(R) Core(TM) i7-8700 CPU @ 3.20GHz 3.19GHz

Reference

  • Kim, W and Menon, S. (1995). A new dynamic one-equation subgrid-scale model for large eddy simulation. In 33rd Aerospace Sciences Meeting and Exhibit, Reno, NV, 1995.