How to set an altitude

Santos-Dumont · August 8, 2011, 03:51

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.

August 8, 2011, 03:51	How to set an altitude	#1
Santos-Dumont Member Charles Join Date: May 2011 Location: France Posts: 77 Rep Power: 14	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

August 8, 2011, 03:55		#2
Santos-Dumont Member Charles Join Date: May 2011 Location: France Posts: 77 Rep Power: 14	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 ? Last edited by Santos-Dumont; August 8, 2011 at 07:06.

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August 8, 2011, 09:23		#3
husker Member Join Date: Mar 2009 Posts: 85 Rep Power: 17	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.