CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

calculating stagnation pressure

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   January 28, 2011, 09:02
Default calculating stagnation pressure
New Member
Join Date: Jan 2011
Posts: 1
Rep Power: 0
uni_student is on a distinguished road

I am conducting a CFD analysis as part of a university project and have a question regarding the calculation and comparison of the stagnation pressure.

The flow is a supersonic compressible flow over a nose cone and I was told a quick check can be done to ensure a correct cfd model. This was to calculate the stagnation pressure using the formula below and comparing it to the static pressure from the analysis:

Stagnation Pressure = Static pressure(1 + 0.2*MachNo^2)^3.5 (assuming ideal gas)

However, my CFD model gives a static pressure of 299 kPa compared to a stagnation pressure of 371 kPa from hand calculations. This may sound really stupid but am I comparing the right values as I assumed the static pressure and stagnation pressure are different?

Any help will be greatly appreciated.
uni_student is offline   Reply With Quote

Old   January 28, 2011, 21:03
Join Date: Feb 2010
Location: Australia
Posts: 65
Rep Power: 7
RossFS is on a distinguished road
Static and Stagnation Pressures are different as you assumed.

To compare the stagnation pressures between what the code is producing and the hand calculation you have, can't you just substitute the static pressure from the software into the stagnation pressure formula you have and compare?
RossFS is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
stagnation pressure boundary problem mbgnfrx2 STAR-CD 2 November 26, 2012 00:55
Fluent natural ventilation pressure boundary condition pierresandre FLUENT 24 November 8, 2011 15:32
UDF to define or adjust pressure??? engahmed FLUENT 0 July 6, 2010 17:19
stagnation pressure boundary condition xqy Phoenics 6 July 1, 2004 03:43
calculating pressure for given velocity Sergei Chernyshenko Main CFD Forum 0 September 12, 2003 12:27

All times are GMT -4. The time now is 09:35.