Pressure definitions

Taron · May 3, 2016, 14:41

Hello guys, please give me the definitions of pressure, total pressure, absolute pressure, and dynamic pressure, and where can I find the static pressure in cfx-post, I find different forums about this, but everywhere there were written very lightly and different, so I want certain definition, thank you.

ghorrocks · May 3, 2016, 21:24

These definitions are correct as far as I know: https://en.wikipedia.org/wiki/Pressure

-Maxim- · May 4, 2016, 02:32

this might also be helpful regarding stn. frame and rel. frame:
http://www.cfd-online.com/Forums/cfx...el-frames.html

pressure = "static" pressure - reference pressure

absolute pressure = pressure + reference pressure

total pressure = pressure + dynamic pressure

Hope I didn't confuse myself by writing that up

Taron · May 5, 2016, 12:53

Thank you Maxim, could you explain me what is dynamic pressure????

ghorrocks · May 6, 2016, 01:29

dynamic pressure = 0.5*density*velocity^2

Taron · May 9, 2016, 08:17

One more question please, are static and hydrostatic pressures the same?

ghorrocks · May 9, 2016, 18:23

Hydrostatic pressure is the static pressure plus the pressure resulting from the weight of fluid above it.

May 3, 2016, 14:41	Pressure definitions	#1
Taron New Member Taron Join Date: Apr 2016 Posts: 9 Rep Power: 10	Hello guys, please give me the definitions of pressure, total pressure, absolute pressure, and dynamic pressure, and where can I find the static pressure in cfx-post, I find different forums about this, but everywhere there were written very lightly and different, so I want certain definition, thank you.

May 4, 2016, 02:32		#3
-Maxim- Senior Member Maxim Join Date: Aug 2015 Location: Germany Posts: 415 Rep Power: 12	this might also be helpful regarding stn. frame and rel. frame: http://www.cfd-online.com/Forums/cfx...el-frames.html pressure = "static" pressure - reference pressure absolute pressure = pressure + reference pressure total pressure = pressure + dynamic pressure Hope I didn't confuse myself by writing that up Taron likes this.

May 6, 2016, 01:29		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	dynamic pressure = 0.5densityvelocity^2 Taron likes this.

May 9, 2016, 18:23		#7
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Hydrostatic pressure is the static pressure plus the pressure resulting from the weight of fluid above it. Taron likes this.

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May 3, 2016, 21:24		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	These definitions are correct as far as I know: https://en.wikipedia.org/wiki/Pressure

May 5, 2016, 12:53		#4
Taron New Member Taron Join Date: Apr 2016 Posts: 9 Rep Power: 10	Thank you Maxim, could you explain me what is dynamic pressure????

May 9, 2016, 08:17		#6
Taron New Member Taron Join Date: Apr 2016 Posts: 9 Rep Power: 10	One more question please, are static and hydrostatic pressures the same?