|
[Sponsors] |
September 10, 2015, 06:11 |
Regarding Laminar/Inviscid Flows
|
#1 |
Member
Join Date: Nov 2014
Posts: 88
Rep Power: 11 |
If I want to simulate a very low turbulence problem, how should I know if I should select laminar or inviscid model in the fluid solver?
Thanks! |
|
September 10, 2015, 06:25 |
|
#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,768
Rep Power: 71 |
Quote:
Your question seems strange ... if you want to set a laminar model that's only for simulating turbulence in a DNS formulation. On the other hand, if you set inviscid flow you should be aware that you cannot simulate confined turbulence and you cannot perform a DNS. So, explain in details what you want to simulate |
||
September 10, 2015, 07:10 |
|
#3 | |
Member
Join Date: Nov 2014
Posts: 88
Rep Power: 11 |
Quote:
I want to compare RANS results with an analytical model (which does not include any turbulence dissipation). so if i want to have CFD results that can be compared with my analytical model (which does not account for turbulence), how should I set my CFD model? invisicd or laminar? thanks! |
||
September 10, 2015, 07:25 |
|
#4 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,768
Rep Power: 71 |
Still not clear ...RANS provides a statistically averaged solution, what about the type of your analytical solution? I see you need for sure a viscous model
|
|
September 10, 2015, 08:17 |
|
#5 | |
Member
Join Date: Nov 2014
Posts: 88
Rep Power: 11 |
Quote:
but i also want to check that when I select a invicid/laminar model in the fluid solver, the solution should equal or almost the same as the invisicid analytical model. making sense here? so my question is: whether i should choose a inviscid or laminar model in the fluid solver to compare to my inviscid analytical model. |
||
September 10, 2015, 08:30 |
|
#6 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,768
Rep Power: 71 |
honestly, I don't see the sense in making comparison between RANS and an inviscid model.... But without more details I can't say much more...
I suppose you should compare an Euler simulation and your inviscid analytical solution |
|
September 10, 2015, 08:47 |
|
#7 | |
Member
Join Date: Nov 2014
Posts: 88
Rep Power: 11 |
Quote:
forget about the RANS part. I am trying to comparing between inviscid model to that from a fluid solver. so the question is what flow physics should I specify for the fluid solver: invisicid or laminar? |
||
September 10, 2015, 08:58 |
|
#8 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,768
Rep Power: 71 |
The Euler inviscid model
|
|
September 12, 2015, 00:46 |
|
#9 | |
Senior Member
Join Date: Feb 2011
Posts: 496
Rep Power: 18 |
Quote:
Correct me if I'm wrong. |
||
September 12, 2015, 16:42 |
|
#10 | |
Member
Join Date: Nov 2014
Posts: 88
Rep Power: 11 |
Quote:
for my case, since I am trying to validate results between a inviscid analytical model to that from a fluid code-solver, i should be using prescribing a fluid with very low viscosity or in this case, the inviscid NS equations. thanks. |
||
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Derivation of the pressure-correction equation for compressible flows | luftraudi | Main CFD Forum | 0 | July 17, 2012 06:35 |
SIMPLE pressure correction in compressible flows | Maarten de Jong | Main CFD Forum | 7 | April 30, 2012 02:23 |
y+ in high Pr flows | vishyaroon | Main CFD Forum | 0 | April 15, 2010 14:24 |
Laminar Solid-Liquid (Two-phase flows) flows in CFX | freemankofi | ANSYS | 0 | April 8, 2010 16:59 |
Free surface flows and multiphase flows | Vidar | Main CFD Forum | 0 | September 18, 2008 05:05 |