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-   -   How to set an altitude (http://www.cfd-online.com/Forums/fluent/91337-how-set-altitude.html)

Santos-Dumont August 8, 2011 03:51

How to set an altitude
 
Hi,

Simple question, I know it looks obvious but I have a doubt. I have 2 different ways to set the altitude that comes in my mind.
I could set the operating pressure to the pressure at this altitude, but I can also go to "Material" and set the density of the air at the proper value.
(For the boundary I use velocity inlet in the entrance)

I guess it would be bad to do both because it would mean a lighter air at a lower pressure and therefore mean a higher altitude than the one I'm looking to get.
So what do you think is the best the altitude in Fluent ?

Thanks
Charles

Santos-Dumont August 8, 2011 03:55

By the way, I use a segregated solver because I'm flying at Mach 0.8. So because the segregated solver is pressure based I should set the pressure only ?

husker August 8, 2011 09:23

Hi Santos,

If you assing a constant or variable density it is supposed to change due to the operating pressure. So let every parameter to be calculated from the operating pressure.


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