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Showing results 1 to 12 of 12 Search took 0.00 seconds. Search: Posts Made By: Martin Hegedus

Forum: FLUENT April 29, 2011, 13:37

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus There seems to be a limit of 5 attachments, so... There seems to be a limit of 5 attachments, so here is the last image.

Forum: FLUENT April 29, 2011, 13:36

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus Attached are the results for my 3D run of the... Attached are the results for my 3D run of the S809 airfoil. M=0.1, Re=2.0e6 (based on chord), alpha=15, fully turbulent SA. My grid is a C grid with 300 cells along chord (I) direction (50...

Forum: FLUENT April 28, 2011, 15:37

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus Unfortunately I'm not close enough at the moment... Unfortunately I'm not close enough at the moment to the local university to access the paper. And when searching for it, there doesn't seem to be a public version available. When I get a chance...

Forum: FLUENT April 27, 2011, 21:59

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus Just for fun I ran Aero Troll CFD... Just for fun I ran Aero Troll CFD (http://www.hegedusaero.com/software.html) on the S809 (Mach=0.10, Re=2e6, fully turbulent SA, characteristic B.C., incoming turb=0.1, C grid, farfield distance=50...

Forum: FLUENT April 26, 2011, 21:13

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus OK, so I think that is the solver you need to... OK, so I think that is the solver you need to use. I believe there is an explicit (uncoupled) and implicit (coupled) solver. The best bet is probably to go with the implicit solver, at least for...

Forum: FLUENT April 26, 2011, 20:54

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus There should be a way to set the Courant (CFL)... There should be a way to set the Courant (CFL) number. The CFL number is usually constant throughout the domain and the actual time step a cell uses is then based on this number and the cell size. ...

Forum: FLUENT April 26, 2011, 16:19

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus I have never used Fluent so the comments I make... I have never used Fluent so the comments I make are either a result of what I've heard or read, or what I guess. Each CFD code is very unique in how they implement things. CFD is much more of an...

Forum: FLUENT April 25, 2011, 20:34

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus I think it is best to use the pressure-based... I think it is best to use the pressure-based method with a compressible solver. For me, it doesn't make sense to have a characteristic B.C. with incompressible flow.

Forum: FLUENT April 25, 2011, 17:12

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus I gather at this point that the question is why... I gather at this point that the question is why the characteristic B.C. (i.e. pressure-far-field) is having issues converging. A characteristic B.C. should be valid for any shaped compressible outer...

Forum: FLUENT April 25, 2011, 14:28

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus OK, so I gather you are using a density based... OK, so I gather you are using a density based method, i.e. compressible, since you are using a characteristic B.C. (i.e. pressure far field). I also assume Fluent's density based method has the...

Forum: FLUENT April 25, 2011, 12:47

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus Hi didiean... Hi didiean (http://www.cfd-online.com/Forums/members/didiean.html), I'm not sure what the issue is with the outer B.C. I'm also not a Fluent user so I can't comment on the details of the B.C. I...

Forum: FLUENT April 24, 2011, 05:59

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,697 Posted By Martin Hegedus Your grid seems to be reasonable. One thing you... Your grid seems to be reasonable. One thing you can try at some point is to move your outer grid even further, i.e. 100 times. You'll see a small difference, but definitely not enough to make up...

Showing results 1 to 12 of 12

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