different pressures in CFX-Post
Hi CFX user, in the compressible flow simulation there are three pressures in the CFX-Post, Absolute Pressure, Pressure and Total pressure. Can anyone tell me what the diffence is? Which pressure is used as the static pressure? thanx in advance Regards
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Re: different pressures in CFX-Post
Pressure = Static Pressure - Reference Pressure Absolute Pressure = Static Pressure + Reference Pressure
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Re: different pressures in CFX-Post
Total Pressure = Static Pressure + Dynamic Pressure
I.e. it is the Stagnation Pressure |
Re: different pressures in CFX-Post
Are you sure Cyclone that in CFX-Post Total Pressure= static pressure + dynamic pressure? Isn't it Total Pressure=static pressure+dynamic pressure-Pref?
(I know that your definition is the right one, but I think that CFX-post is internaly changing the definition, 'cause if you plot pressure and total pressure over a wall surface you find the same...) Let me know if you think I'm wrong, because it's something that I have only noticed by myself... |
Re: different pressures in CFX-Post
Sorry, you're right. It is reported relative to the domain reference pressure.
At a wall, the velocity is zero, so the dynamic pressure is zero and thus the total pressure is equal to the static pressure. -CycLone |
Hi!
In CFD-Post I can only choose between "pressure" and "total pressure" to be shown on my plane. I need the "static pressure", so I have to choose "pressure"? Am I right? |
Pressure is the static pressure. Note it has the hydrostatic component removed, if that is relevant. See the documentation for more information.
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Is it possible to draw dynamic pressure directly in Ansys CFX ?
Because I can draw the figures whic can show the distrubition of the static pressure and total pressure, but I wanna see the distrubition of the dynamic pressure. If you can explain how it can be possible, I would be very gratefull. |
Define a variable with an expression Total Pressure - Pressure. Then it is a variable you can do anything you like with.
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