nozzle problem

kabilan · September 20, 2014, 09:03

good evening,
i have only total pressure value of my nozzle, how can i find static pressure and total pressure value.
what should i have to give supersonic pressure in boundary condition.
thank you....

agd · September 20, 2014, 14:04

What is the design Mach number? If you know the exit Mach number then you can easily compute static pressure at the exit.

kabilan · September 20, 2014, 23:07

yeah very thank you sir,
i have calculated by using pressure ratio and mach number(M=2) relation.
now i have pressure ratio about 7 of nozzle.
for this problem what turbulence model should i use k-e or spa.alm?
and why?
thank you

agd · September 21, 2014, 22:45

You should run both so you can develop experience in determining which one gives better results in these sorts of flows.

Ivanrips · September 22, 2014, 00:07

Hi,
Here tutorials de Laval nozzle in CFX

Part 1
https://www.youtube.com/watch?v=FDG08sWbrOU

Part 2
https://www.youtube.com/watch?v=Q-6y4DaTwS4

Part 3
https://www.youtube.com/watch?v=J2vDKbh6Gqc

Part 4
https://www.youtube.com/watch?v=m8g4OoPpL7U

Regards

September 20, 2014, 09:03	nozzle problem	#1
kabilan Member kabilan.B Join Date: Jul 2010 Location: chennai Posts: 79 Rep Power: 15	good evening, i have only total pressure value of my nozzle, how can i find static pressure and total pressure value. what should i have to give supersonic pressure in boundary condition. thank you....

September 20, 2014, 23:07	nozzle pressure	#3
kabilan Member kabilan.B Join Date: Jul 2010 Location: chennai Posts: 79 Rep Power: 15	yeah very thank you sir, i have calculated by using pressure ratio and mach number(M=2) relation. now i have pressure ratio about 7 of nozzle. for this problem what turbulence model should i use k-e or spa.alm? and why? thank you

September 22, 2014, 00:07	Nozzle Tutorials	#5
Ivanrips New Member Roger Iván Join Date: Jun 2009 Location: Perú Posts: 22 Rep Power: 16	Hi, Here tutorials de Laval nozzle in CFX Part 1 https://www.youtube.com/watch?v=FDG08sWbrOU Part 2 https://www.youtube.com/watch?v=Q-6y4DaTwS4 Part 3 https://www.youtube.com/watch?v=J2vDKbh6Gqc Part 4 https://www.youtube.com/watch?v=m8g4OoPpL7U Regards

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September 20, 2014, 14:04		#2
agd Senior Member Join Date: Jul 2009 Posts: 351 Rep Power: 18	What is the design Mach number? If you know the exit Mach number then you can easily compute static pressure at the exit.

September 21, 2014, 22:45		#4
agd Senior Member Join Date: Jul 2009 Posts: 351 Rep Power: 18	You should run both so you can develop experience in determining which one gives better results in these sorts of flows.