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DAK565656 February 26, 2006 10:39

Reference pressure
Hello! Please explain me one thing, When I know chord of airfoil, speed of flow, density and viscosity, I can calculate Re and mach numbers. But what if they are not just like in experiment? For example, changing speed I change mach number, set it to experiment value, bit Re don't match with experimental Re. As far as I understand experiments were conducted using different then 1 atm reference pressure. And now it's a question: how density and viscosity change when reference pressure changes? I conduct all calculations in CFX 10. I set ref pressure to particular value, assuming that density increasing in exactly the same manner as pressure and viscosity stays constant. Is that right? Does CFX solver takes into account changes in density and viscosity when I change reference pressure?

tommy February 27, 2006 12:45

Re: Reference pressure
Try to refer to the adimensionalization of the Navier-Stokes equations, but also to the adim. of the state equation!!

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