Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Incorrect formula for supersonic total pressure calculation

Updated Threads

Reply

Search this Thread

September 21, 2021, 08:51	Incorrect formula for supersonic total pressure calculation	#1
sphani4391 New Member Sai Darbha Join Date: Aug 2019 Posts: 8 Blog Entries: 2 Rep Power: 7	The static pressure for the totalPressure boundary condition for compressible, supersonic flow in OpenFoam-v2012 is given in doxygen and the code as: $P_s = \frac{P_T}{\left( 1 + \psi \left( \frac{\gamma -1}{2 \gamma} \right) \|\vec{u}\|^2 \right)^{\gamma / (\gamma -1)}}$ where the compressibility, psi is related to the speed of sound, c as $\psi = \frac{1}{c^2}$ However, the isentropic relation for supersonic flows relate the static pressure to stagnation pressure as: $P_s = \frac{P_T}{\left( 1 + \psi \left( \frac{\gamma -1}{2 } \right) \|\vec{u}\|^2 \right)^{\gamma / (\gamma -1)}}$ For reference, have a look at: https://www.grc.nasa.gov/www/k-12/ai.../isentrop.html Is this a bug or am I missing something? Please suggest. Thanks, Sai

Reply

Tags

bug in openfoam, totalpressure bc

« Previous Thread | Next Thread »

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 Forum Rules

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to get the total pressure in the UDF?	zgzhai	Fluent UDF and Scheme Programming	3	September 24, 2018 17:12
Residuals and forces spiraling out of control before failing	edomalley1	OpenFOAM Running, Solving & CFD	3	September 7, 2018 11:42
static vs. total pressure	auf dem feld	FLUENT	17	February 26, 2016 14:04
Total pressure in CFX	famarcfd	CFX	0	June 17, 2011 11:33
Static vs Total Pressure	Alfonso Ferrandez	FLUENT	2	May 23, 2000 09:53

All times are GMT -4. The time now is 14:33.