Square channel with a curved section

Update: November 26, 2018
OpenFOAM 4.x

Case directory



We calculate the air flow through a square channel of 50 mm × 50 mm with a curved section.

The air flows in from the region "inlet" at 0.5 kg/s and out from the region "outlet". The walls of the flow channel are set to no-slip wall.

Model geometry Model geometry

The standard k-ε model is used for the turbulence model.

The meshes are as follows, and the number of mesh is 112400.

Mesh (entire) Mesh (entire)
Mesh (curved section) Mesh (curved section)

If you want to visualize turbulent energy and turbulent dissipation rate, check "k" and "epsilon" in the "Properties" tab in ParaView.

Check k and epsilon in Properties tab Check "k" and "epsilon" in "Properties" tab

The calculation result is as follows.

Flow velocity (U) Flow velocity (U)
Pressure (p) Pressure (p)
Turbulent energy (k) Turbulent energy (k)
Turbulent dissipation rate (epsilon) Turbulent dissipation rate (epsilon)

We can see that the pressure drops significantly at the curved section.


cp -r $FOAM_TUTORIALS/compressible/rhoSimpleFoam/squareBend squareBend
cd squareBend

mpirun -np 8 rhoSimpleFoam -parallel
reconstructParMesh -mergeTol 1e-06


Calculation time

20.68 seconds *8 parallel、Inter(R) Core(TM) i7-8700 CPU @ 3.20GHz 3.19GHz