How to convert pressure-inlet to velocity-inlet?

tengf689 · April 9, 2017, 10:41

Hi all
I have a question about how can I convert the pressure-inlet to velocity-inlet.
I did a simulation on a compressor balde using CFX, and the inlet boundary conditions were 'Total Pressure','Total temprature' and 'flow angle'. The result was quite good.
But now I want to use velocity-inlet instead of pressure-inlet. So I extract velocity components from pressure-inlet case, and then impose the velocity components to velocity-inlet case. The static pressure at outlet are the same. Unfortunately, I can not get the same result. From the monitor, I found that the total pressure are quite large at the inlet.
Can anybody explain the reason?????? Thanks a lot

LuckyTran · April 28, 2017, 23:31

You also should extract the static temperature and apply this at the inlet.

April 9, 2017, 10:41	How to convert pressure-inlet to velocity-inlet?	#1
tengf689 New Member FeiTeng Join Date: Jan 2017 Location: Beijing,China Posts: 12 Rep Power: 9	Hi all I have a question about how can I convert the pressure-inlet to velocity-inlet. I did a simulation on a compressor balde using CFX, and the inlet boundary conditions were 'Total Pressure','Total temprature' and 'flow angle'. The result was quite good. But now I want to use velocity-inlet instead of pressure-inlet. So I extract velocity components from pressure-inlet case, and then impose the velocity components to velocity-inlet case. The static pressure at outlet are the same. Unfortunately, I can not get the same result. From the monitor, I found that the total pressure are quite large at the inlet. Can anybody explain the reason?????? Thanks a lot

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Pressure Outlet Guage pressure	Mohsin	FLUENT	36	April 29, 2016 17:16
Pressure inlet vs outlet position, transient, time dependent pressure and gravity	silent2608	FLUENT	0	February 6, 2016 10:19
Pressure loss Velocity coupling	CFXMUFFIN	CFX	1	February 6, 2016 04:43
Set inlet velocity and pressure in cavitational model	GerardX89	FLUENT	1	July 5, 2012 16:17
what the result is negatif pressure at inlet	chong chee nan	FLUENT	0	December 29, 2001 05:13

April 28, 2017, 23:31		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	You also should extract the static temperature and apply this at the inlet.