# Theoretical problem：entropy & pressure

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

July 19, 2015, 12:38
Theoretical problem：entropy & pressure
#1
New Member

Join Date: Oct 2013
Posts: 1
Rep Power: 0
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 ?

Attached Images
 ??????Computational Fluid Dynamics The Basics with Applications _??_1.jpg (65.2 KB, 12 views)

Last edited by Sun Yachuan; July 19, 2015 at 12:39. Reason: email

 July 27, 2015, 14:38 #2 Member   Join Date: Dec 2012 Posts: 79 Rep Power: 4 Hi 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.

 Tags entropy, pressure, theoretical

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Mihail CFX 7 September 7, 2014 06:27 cdm OpenFOAM Running, Solving & CFD 4 July 21, 2013 16:24 immortality Main CFD Forum 0 May 2, 2013 13:30 joshi20h FLUENT 0 September 26, 2012 12:41 zgzhai Fluent UDF and Scheme Programming 2 September 12, 2012 06:15

All times are GMT -4. The time now is 05:39.