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

Theoretical problem:entropy & pressure

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

LinkBack Thread Tools Search this Thread Display Modes
Old   July 19, 2015, 13:38
Default Theoretical problem:entropy & pressure
New Member
Join Date: Oct 2013
Posts: 1
Rep Power: 0
Sun Yachuan is on a distinguished road
I'm learning this book<Computational Fluid Dynamics The Basics with Applications>John D.Anderson,JR

I have some questions in section7.6.1
1.wath's the relationship between entropy & pressure?(why pressure is constant while entropy is constant? Why p02<p01 while s2>s1?)
2.Why A1*=At,obviously,they are not equal in FIG 7.22 ?


Last edited by Sun Yachuan; July 19, 2015 at 13:39. Reason: email
Sun Yachuan is offline   Reply With Quote

Old   July 27, 2015, 15:38
Join Date: Dec 2012
Posts: 92
Rep Power: 13
beer is on a distinguished road

you're in the wrong forum. Anyway:

1. It says the total pressure is constant. The pressure does change indead.
2. A* is the sonic throat, which is At berfore the shock. A* is just the area at which you reach Ma=1 for the first time.
beer is offline   Reply With Quote


entropy, pressure, theoretical

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Pressure Driven Supersonic Flow in Converging-Diverging Nozzle cdm OpenFOAM Running, Solving & CFD 7 August 28, 2019 02:37
How to get the total pressure in the UDF? zgzhai Fluent UDF and Scheme Programming 3 September 24, 2018 17:12
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 07:27
replacing of shock tube high pressure part with a boundary condition for low pressure immortality Main CFD Forum 0 May 2, 2013 14:30
Unsteady pressure differential between inlet and outlet of the pipe for single phase joshi20h FLUENT 0 September 26, 2012 13:41

All times are GMT -4. The time now is 21:34.