# different pressures in CFX-Post

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 November 4, 2008, 06:33 different pressures in CFX-Post #1 sometimes1900 Guest   Posts: n/a 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

 November 4, 2008, 10:51 Re: different pressures in CFX-Post #2 John S. Guest   Posts: n/a Pressure = Static Pressure - Reference Pressure Absolute Pressure = Static Pressure + Reference Pressure

 November 4, 2008, 11:39 Re: different pressures in CFX-Post #3 CycLone Guest   Posts: n/a Total Pressure = Static Pressure + Dynamic Pressure I.e. it is the Stagnation Pressure

 November 5, 2008, 06:02 Re: different pressures in CFX-Post #4 Pascal Guest   Posts: n/a 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...

 November 6, 2008, 12:30 Re: different pressures in CFX-Post #5 CycLone Guest   Posts: n/a 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

 February 5, 2013, 12:10 #6 Member   Join Date: Dec 2012 Posts: 32 Rep Power: 4 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?

 February 5, 2013, 18:13 #7 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,800 Rep Power: 85 Pressure is the static pressure. Note it has the hydrostatic component removed, if that is relevant. See the documentation for more information.

 July 12, 2015, 09:14 #8 New Member   sertac Join Date: Feb 2015 Posts: 6 Rep Power: 2 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.

 July 12, 2015, 18:47 #9 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,800 Rep Power: 85 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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