The domain comprises a 2D rectangular slab as shown below:
Several meshes are employed to highlight the sensitivity of the computed skin friction coefficient to the near wall \( y^+ \) over the range \( 0.05 < y^+ < 100 \). All meshes are generated using blockMesh and employ the same number of cells whereby the first cell height is varied by changing the expansion ratio from the wall patch.
Velocity: U
Patch | condition | value |
---|---|---|
Inlet | fixedValue | 69.4 m/s in x |
Outlet | zeroGradient | |
Walls | noSlip |
Pressure: p
Patch | condition | value |
---|---|---|
Inlet | zeroGradient | |
Outlet | fixedValue | 0 Pa (static) |
Walls | zeroGradient |
Turbulence viscosity: nut
Patch | condition | value |
---|---|---|
Inlet | calculated | |
Outlet | calculated | |
Walls | nutUSpaldingWallFunction |
Inlet conditions are based on an inlet turbulence intensity of 0.0039%, and turbulence viscosity ratio of 0.009.
Turbulence kinetic energy: k
Patch | condition | value |
---|---|---|
Inlet | fixedValue | based on 0.039% intensity |
Outlet | zeroGradient | |
Walls | kqRWallFunction |
Turbulence specific dissipation rate: omega
Patch | condition | value |
---|---|---|
Inlet | fixedValue | based on nut/nu = 0.009 |
Outlet | zeroGradient | |
Walls | omegaWallFunction |
The following figures show the predicted skin friction coefficient as a function of Reynolds number, compared against the experimental data from Weighardt [95]
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