|
[Sponsors] |
Assistance for modelling unsteady supersonic flow in FLUENT |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
October 14, 1999, 03:01 |
Assistance for modelling unsteady supersonic flow in FLUENT
|
#1 |
Guest
Posts: n/a
|
Dear Sir,
Project : Supersonic flow past rectangular cavity located in at the bottom wall of the rectangular test section. The inlet condition from CD nozzle to test section having rectangular cavity at bottom wall is constant at 1.5 mach & 3.6bar. Due to presence of cavity, the flow becomes unsteady. There willbe oscillating shock waves & acoustic oscillations generated from cavity. Hence I need to evaluate pressure at every approx 10 microsecond for 25000 times at selected nodal points on the top wall so that with this data I can determine the frequencies of pressure oscillation in the test test section using FFT. I would like to use fluent package for this. Kindly clarify me the following: 1. Is it possible to model this unsteady, compressible, viscous 2D/3D supersonic flow with fluent package. 2. How to evaluate pressure at selected nodes at every 10 microsecond for 25000(25 thousand) times? Thanking in anticipation of response. |
|
October 14, 1999, 04:45 |
Re: Assistance for modelling unsteady supersonic flow in FLUENT
|
#2 |
Guest
Posts: n/a
|
I don't know how well fluent handels this kind of flow. Rampant should do this.
For reporting tasks I normally use a user-defined-subroutine to write out these data to a file. So you get a table suitable for a fft without the need to stop the calculation or doing a nasty transient postprocessing. Good luck |
|
October 16, 1999, 13:58 |
Re: Assistance for modelling unsteady supersonic flow in FLUENT
|
#3 |
Guest
Posts: n/a
|
I think Rampant is now part of Fluent 5. You get at it by choosing the coupled solver instead of the segregated solver
|
|
October 23, 1999, 21:39 |
Re: Assistance for modelling unsteady supersonic flow in FLUENT
|
#4 |
Guest
Posts: n/a
|
Coupled solver in FLUENT 5 will do the job. For recording pressure history, you should generate the points first. And record time history of pressure signal at those points. For details, please contact your support engineer.
|
|
April 6, 2014, 10:29 |
supersonic cavity flow
|
#5 |
New Member
Rajeev C
Join Date: Jan 2013
Location: India
Posts: 6
Rep Power: 13 |
Hi
I am trying to solve such a problem now. Did you solve the problem in fluent? please let me know. Thank you |
|
April 6, 2014, 12:01 |
|
#6 |
Member
venki
Join Date: May 2011
Posts: 84
Rep Power: 15 |
Ya fluent will work in supersonic flow,u can monitor the data based on your requirements
|
|
April 6, 2014, 15:57 |
Supersonic cavity flow
|
#7 |
New Member
Rajeev C
Join Date: Jan 2013
Location: India
Posts: 6
Rep Power: 13 |
Hi Venkatesh
Thank you. i am trying to solve internal flow of M =1.65 over a cavity. I tried transient simulation initiated by a steady state solution. But no unsteady effects was noted and the shear layer did not oscillate. i am using Density based solver. I have tried mesh refinement and also time step of 1e-6 to 1e-10. Regards |
|
April 6, 2014, 16:00 |
|
#8 |
New Member
Rajeev C
Join Date: Jan 2013
Location: India
Posts: 6
Rep Power: 13 |
Hi Venkatesh
Thank you. i am trying to solve internal flow of M =1.65 over a cavity. I tried transient simulation initiated by a steady state solution. But no unsteady effects was noted and the shear layer did not oscillate. i am using Density based solver. I have tried mesh refinement and also time step of 1e-6 to 1e-10. Regards |
|
April 6, 2014, 16:56 |
Supersonic
|
#9 |
Member
venki
Join Date: May 2011
Posts: 84
Rep Power: 15 |
Hi rajeev
how your confirming there is no change in flow? r u monitoring any location? |
|
April 6, 2014, 16:58 |
|
#10 |
Member
venki
Join Date: May 2011
Posts: 84
Rep Power: 15 |
Pressure based coupled solver will work better based on my experience, it will vary based on BC
|
|
April 7, 2014, 02:39 |
|
#11 |
New Member
Rajeev C
Join Date: Jan 2013
Location: India
Posts: 6
Rep Power: 13 |
Hi Venkatesh
I am using pressure inlet and pressure outlet and the remaining as wall boundary conditions. To see oscillations I am monitoring pressure at front and aft wall of the cavity. Animation of Mach no. contour is made but no oscillation of shear layer is observed. |
|
October 1, 2014, 23:36 |
|
#12 |
New Member
Dhaval Shiyani
Join Date: Sep 2012
Posts: 7
Rep Power: 14 |
Hello Rajeev,
Did you figure out the solution to the problem? I am doing something similar, though subsonic, but I too can't see the oscillation in the shear layer! Regards, Dhaval |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Having Problem solving 2D supersonic flow around a plug nozzle | chrislloyd | FLUENT | 7 | July 22, 2015 14:09 |
Split boundary zone in FLUENT for mass flow | eishinsnsayshin | FLUENT | 1 | January 18, 2013 14:43 |
Jet in Supersonic Crossflow, controlling mass flow rate | ChrisA | OpenFOAM Running, Solving & CFD | 3 | November 13, 2012 19:20 |
Incompressible, Unsteady Cylinder Flow | startingcfd | Main CFD Forum | 1 | March 15, 2011 02:12 |
Fluent supersonic flow | shuo | Main CFD Forum | 0 | June 2, 2008 08:02 |