|
[Sponsors] |
October 29, 2010, 03:26 |
Con-Div Nozzle Shock structure problem
|
#1 |
New Member
padhu
Join Date: Jun 2009
Location: Bangalore, India
Posts: 27
Rep Power: 17 |
Dear All,
I'm working in simulation of supersonic flow through Nozzle. I need to simulate shock structure at the exit of the nozzle. My problem is, I need to simulate normal shock at the exit. for that I have calculated the exit pressure using the normal shock relation (analytically). when i am using the calculated pressure the solution diverges. I observed that the shock is found upto certain iterations, and suddenly the solution diverges. What kind of boundary conditions have to be choosen? What may be the appropriate pressure ratio suitable for this problem? In case, If I am increasing the nozzle length do i can able to capture the shock? The Simulation specifications are, Nozzle Length = 3.1 m , Throat is at 1 m from inlet, Area ratio (Aexit/A*) = 2.53, Designed Mexit = 2.53. The solver details are, density based, implicit, axi-symmetric, steady, inviscid flow. Thanks in advance, padmanathan |
|
November 15, 2010, 03:28 |
|
#2 |
Member
Chris, Kam
Join Date: Nov 2010
Location: Busan, South Korea
Posts: 42
Rep Power: 16 |
I have same problem
and I tried... It's Unstable but I did with "pressure_far_field" conditions, in Ambient. I'm sure that there be more nice solution |
|
November 16, 2010, 04:37 |
|
#3 |
New Member
padhu
Join Date: Jun 2009
Location: Bangalore, India
Posts: 27
Rep Power: 17 |
thanks for your reply, chris.
by now, i changed my solution from second order upwind scheme to first order scheme. now i can able to simulate by increasing the back pressure upto some level. and in order to follow first order scheme, i doubled the grid resolution to maintain the accuracy. |
|
Tags |
nozzle flow, shock detection |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
analytical solution of 1D shock tube problem | ma | Main CFD Forum | 10 | May 11, 2015 06:20 |
Sod shock tube problem with real gas effects | ganesh | Main CFD Forum | 0 | October 17, 2006 02:22 |
SOD shock tube problem | Luuk | Main CFD Forum | 3 | September 6, 2005 06:08 |
Shock tube problem | ger | Main CFD Forum | 1 | September 24, 2003 08:41 |
shock problem | arief | Main CFD Forum | 10 | October 22, 1998 20:22 |