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Forum: Main CFD Forum

April 6, 2017, 18:20

Replies: 13

Discrepancy in the Strouhal number of a flow past circular cylinder

Views: 1,343

Posted By HectorRedal

I have double-checked again the reference and I...

I have double-checked again the reference and I have realized that the velocity is approximated using the following formula:
U_n+1 =U_n + delta t *(-d (u_j * rho * U_i) / dx_j + d tau_ij / dx_j -...

Forum: Main CFD Forum

March 22, 2017, 16:47

Replies: 13

Discrepancy in the Strouhal number of a flow past circular cylinder

Views: 1,343

Posted By HectorRedal

Sorry, but I have realized that the CBS Algorithm...

Sorry, but I have realized that the CBS Algorithm is a second order time approximation algorithm:
U(n+1) = U(n) - U(n) * delta T * (d U(n) / dx) + O (delta T^2)

Forum: Main CFD Forum

March 22, 2017, 16:11

Replies: 13

Discrepancy in the Strouhal number of a flow past circular cylinder

Views: 1,343

Posted By HectorRedal

The algorithm I have implemented is the CBS...

The algorithm I have implemented is the CBS Scheme:...

Forum: Main CFD Forum

March 22, 2017, 15:14

Replies: 13

Discrepancy in the Strouhal number of a flow past circular cylinder

Views: 1,343

Posted By HectorRedal

This limitation can be overcome reducing the time...

This limitation can be overcome reducing the time step. This way the O(dt) becomes small. If this is the problem, the accuracy of the simulation can be imprved easily (reducing the delta t). The...

Forum: Main CFD Forum

March 22, 2017, 06:04

Replies: 13

Discrepancy in the Strouhal number of a flow past circular cylinder

Views: 1,343

Posted By HectorRedal

Your comment is quite interesting from my point...

Your comment is quite interesting from my point of view.
You are comparing balance numerical stability vs boundedness. Can you elaborate a bit more your statement?

On the other hand, the...

Forum: Main CFD Forum

March 22, 2017, 05:57

Replies: 13

Discrepancy in the Strouhal number of a flow past circular cylinder

Views: 1,343

Posted By HectorRedal

The discretization of the convective term does...

The discretization of the convective term does not have any artificial viscosity, a-priori.
Up to my knowledge, the discretization of the convective term is second order accurate, O(h^2):
C * U +...

Forum: Main CFD Forum

March 21, 2017, 17:04

Replies: 13

Discrepancy in the Strouhal number of a flow past circular cylinder

Views: 1,343

Posted By HectorRedal

Discrepancy in the Strouhal number of a flow past circular cylinder

Hi,

I am simulating a flow past a circular cilinder of an incompressible flow.
The characteristics of the flow I am using are the following:
- Re = 100
- Incompressible flow
- Isothermal flow...

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