[maruthamuthu_venkatraman]

Hello Foamers,

Iam trying to predict the vortex shedding for Cylinder at Re 1.2E+05 using Low Re KE model Launder and sharma .

Observed Results :

1. Drag coefficient is not at all oscillating in a regular pattern even after 20 Shedding periods. Finally it gives me a constant value of 0.2.

2. Lift coeffcient starts to oscillate in the begining and then it becomes constant with a value of 1.5 after 6 vortex shedding periods.

3. Yplus is less than 1 , All turbulent quantities are set to 1e-10 for cylinder walls. Symmetry BC is used on the top and bottom domain.
Outlet is set to constant with 0 for pressure and all others are set to zero gradient.

4. k and e values are 0.35 and 310 at inlet.

5. Grid is fine enough to capture this frequency.


If anybody has Successfully predicted the shedding frequency at Re 1e+05 , Then shed some light upon this problem.

Residual for last time step.

Time = 74.2625

Courant Number mean: 0.0140374 max: 0.288887
DICPCG: Solving for p, Initial residual = 0.00921648, Final residual = 8.75815e-05, No Iterations 55
time step continuity errors : sum local = 6.25117e-11, global = 8.42844e-13, cumulative = -3.73129e-13
DICPCG: Solving for p, Initial residual = 0.00491658, Final residual = 4.72697e-05, No Iterations 57
time step continuity errors : sum local = 3.37288e-11, global = 8.02879e-13, cumulative = 4.2975e-13
DICPCG: Solving for p, Initial residual = 0.00082418, Final residual = 7.74048e-06, No Iterations 60
time step continuity errors : sum local = 5.51504e-12, global = 1.09791e-12, cumulative = 1.52766e-12
DILUPBiCG: Solving for epsilon, Initial residual = 3.74769e-06, Final residual = 3.74769e-06, No Iterations 0
DILUPBiCG: Solving for k, Initial residual = 5.534e-06, Final residual = 5.534e-06, No Iterations 0


Thanks