Usually the distance between inlet boundary and body about 5 size of body. For what purpose? Why cannot located body very close to boundary?
I simulate the flow around bridge section, VIV and Karen vortex street. Try to understand the influence on inlet Turbulence Intensity. I choose 0.01% and 10%, ratio 10 and result was the same.
The greater the distance of the object from the inlet, the smaller the impact of turbulence boundary conditions on the result.
Anastasia Klimova The closer the object is to the inlet, the more important the turbulence boundary conditions at the inlet are, as I mentioned earlier. An analogous case is the flow around an obstacle in a pipe. If we set a parabolic profile at the inlet, the hydraulic run-up can be much shorter than when a piston flow is set at the inlet. Depending on the flow, often characterized by the Reynolds number, there is a minimum distance required for the velocity profile to be established, etc. Hydraulic run-up limitation shortens the calculations because a smaller computational domain means fewer computational cells, but it forces the engineer to pay more attention to the selection of appropriate boundary conditions.
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