
[Sponsors] 
January 11, 2014, 05:48 

#41 
Senior Member

In my opinion one of the biggest advantage is that PowerFLOW is really stable and it is almost impossible to get a simulation to blow up (unless you are making big setup mistakes or your geometry has serious issues).
Besides, as you already pointed out, PowerFLOW is a transient (and transient only) code. If you need transient results, a simulation performed with PowerFLOW will take less time (much much less time) than a DES or LES. On the other hand, if you can do with steady results, PowerFLOW will take more time to solve the case than a RANS simulation. Eventually the mesh: meshing is relatively quick and you can get a lot of cells without any problem. The volume mesh is a cartesian grid made of hexahedra so no issues nor skewness nor stretching with 3D elements. 

January 13, 2014, 05:15 

#42  
Senior Member
cfdnewbie
Join Date: Mar 2010
Posts: 551
Rep Power: 11 
Quote:
Quote:
Quoting their website: Quote:


January 13, 2014, 07:42 

#43  
Senior Member

Quote:
Quote:
Let me rephrase my statement: If you can do with steady state results then PowerFLOW will (of course) take more time than a RANS to give you your results (it will perform a transient simulation anyway and then you can average your results in order to have something similar to a RANS). If you need transient results (such as the ones a LES or a DES will provide you) then your case will be solved in much less time than a LES/DES. 

January 13, 2014, 12:42 

#44  
Senior Member
cfdnewbie
Join Date: Mar 2010
Posts: 551
Rep Power: 11 
Quote:
Quote:
Do you have any comparisons / papers on this? I would be very much interested in seeing the hard facts on this, as I'm very much interested in accuracy and efficiency of numerical methods for LES. It would be nice to have a test case with comparable DOF, LES with a NS based solver (if it is a good one ) and Powerflow, compared against DNS. Is there a paper on DNS comparison of LB and DNS? I guess there must be, and for low Knudsen numbers, they should indeed give the same results.... 

January 13, 2014, 14:56 

#45  
Senior Member

Quote:
Quote:
http://exa.com/web_support_2012/exa_tech_pubs.html Not sure if you can find what you are looking for though… Also on sciencedirect you can find lots of papers by looking for "powerflow". 

Tags 
aeroacoustics, aerodynamics, exa, lbe, powerflow 
Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Adding a term to Navier Stokes Equation  ashtonJ  CFX  3  January 15, 2011 07:32 
ILU for Navier stokes problems  Raju  Main CFD Forum  5  July 29, 2006 14:15 
Navier stokes compresible viscid flow fea, somebody can help?  Jose Choy  Main CFD Forum  3  October 24, 2003 02:28 
Newbie:Viscoelasticity and Navier stokes equation  Rajil Saraswat  Main CFD Forum  2  June 9, 2003 07:21 
help: I am trying to solve Navier Stokes compressible and viscid flow  Jose Choy  Main CFD Forum  2  May 18, 2000 05:45 