Hello everyone,
I numerically study an airflow over a conduite using ANSYS FLUENT. I want to define a velocity-inlet Bondary condition for an interior face inside the conduite.
I will be satisfied if you could help me achieve this.
Thank you!
If I understand correctly, it depends on the geometry of the edges of the conduit inlet (assuming that its cross section is circular) and the Reynolds number (Re). You might find illustrating the first figure of the attached paper, where the velocity profile at a round orifice (i.e., akin to the entrance of a conduit with sharp edges) is obtained as a function of Re. Thus, my general response to this question would be to include part of the upstream domain of the inlet in the Fluent geometry. For example, defining a hemisphere (if you have a planar entry) with three or four times the diameter of the inlet and aligned with the axis of the conduit. You may use a uniform radial velocity at the surface of the virtual hemisphere equating the flow rate through the conduit. Hope it helps.
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