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Showing results 1 to 19 of 19 Search took 0.00 seconds. Search: Posts Made By: didiean

Forum: FLUENT April 28, 2011, 02:00

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean I read this paper before. It seems that CFD... I read this paper before. It seems that CFD using full turbulence model cannot predict the Cl as well as that using transitional models. I get nearly the same conclusion. But I can't explain it. I...

Forum: FLUENT April 27, 2011, 23:02

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Thanks a lot~ I have heard some interesting... Thanks a lot~ I have heard some interesting comments that people who doing experiments and CFD never trust what they get. Maybe I expect too much from CFD. As the Cl is 0.1469 at 0 AOA, I just...

Forum: FLUENT April 27, 2011, 20:44

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Currently, I just simulate the steady case. I... Currently, I just simulate the steady case. I don't quite understand what you you mean by "change it to time dependent". If you mean simulating unsteady case, for FLUENT, it includes unsteady solver...

Forum: FLUENT April 27, 2011, 08:36

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Thank you~ What I want to investigate is on... Thank you~ What I want to investigate is on wind turbine. Just because lots of experimental and simulating data are available for S809. This is easy to compare for my first stage of simulation.

Forum: FLUENT April 27, 2011, 03:30

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Well~Coupled scheme for pressure-velocity... Well~Coupled scheme for pressure-velocity coupling does seem to work. But the reason still remains not clear. As I know somebody does use normal SIMPLE to get the convergent results~ Thanks a lot~...

Forum: FLUENT April 26, 2011, 21:07

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Well, for FLUENT, only the density-based solver... Well, for FLUENT, only the density-based solver can activate the set of CFL number~~:o

Forum: FLUENT April 26, 2011, 20:29

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Thank you very much. For pressure-far-field BC,... Thank you very much. For pressure-far-field BC, I just try to simulate flow field around an airfoil at 0 deg AOA. When I use velocity-inlet & outflow BC using Transition SST model (turbulence model...

Forum: FLUENT April 26, 2011, 04:53

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Thanks a lot for your kind advices. Well, as I... Thanks a lot for your kind advices. Well, as I change the chord length of the airfoil, and then using Standard discretization instead of Two order, a convergent result is obtained. But if I change...

Forum: FLUENT April 25, 2011, 21:59

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Hi~ I tried to reduce the chord length of the... Hi~ I tried to reduce the chord length of the airfoil from 1 to 0.5, kept the Reynolds number constant and the Mach number became 0.17. But unfortunately, it didn't get convergent well as I had...

Forum: FLUENT April 25, 2011, 20:45

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Thanks~ Well, maybe I have misled you. From one... Thanks~ Well, maybe I have misled you. From one version of FLUENT, it is using the density/pressure-based solver instead of compressible/incompressible solver.

Forum: FLUENT April 25, 2011, 20:40

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Well, that's what is frustrating me most,... Well, that's what is frustrating me most, everything seems right except the results. From the point of grid, methodology, physics. I still get another question, as you see, Re=rou*u*L/miu, when I...

Forum: FLUENT April 25, 2011, 20:03

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Thanks for your advice. But the rectangular seems... Thanks for your advice. But the rectangular seems almost the same with the C-type domain at the wake area of the airfoil, besides, C-type domain may have a grid with higher quality on the left of the...

Forum: FLUENT April 25, 2011, 19:49

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Well, in fact, I was using a pressure-based... Well, in fact, I was using a pressure-based method (incompressible solver) only changed the material from normal air to ideal-gas, as for FLUENT, only the ideal-gas can use pressure-far-field BC. I...

Forum: FLUENT April 25, 2011, 13:30

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Hi~ Thanks for your reply The... Hi~ Thanks for your reply The pressure-far-field BC is often adopted when simulating wind turbine airfoil as I know from others. Compared to inlet and outflow BCs, it has low chance to introduce...

Forum: FLUENT April 25, 2011, 11:16

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Would anybody be so kind to help me? Hope my poor English won't stop your procedure to continue reading. I try to construct a better grid, and try different topologies. But, still, it is not easy to get a convergent result using...

Forum: FLUENT April 24, 2011, 08:21

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean For the turbulent boundary conditions, I define... For the turbulent boundary conditions, I define turbulent Intensity 0.2% and Turbulent Viscosity Ratio 2. People around me said this is the parameter for low velocity wind tunnel. Does this set make...

Forum: FLUENT April 24, 2011, 07:47

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean As I mentioned divergence for pressure-far-field... As I mentioned divergence for pressure-far-field boundary conditions, one of the results is like this.

Forum: FLUENT April 24, 2011, 07:37

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Thanks for your reply~ Sorry I didn't describe... Thanks for your reply~ Sorry I didn't describe my model in detail. The airfoil is a wind turbine airfoil S809 whose relative thickness is 21%. Re=2 million, so if I use pressure-far-field, the Mach...

Forum: FLUENT April 24, 2011, 03:45

Replies: 39 Trying to perform test validity of Fluent with simulation of 2D airfoil Views: 14,677 Posted By didiean Trying to perform test validity of Fluent with simulation of 2D airfoil Hello, everyone! My English is not very good, hope I can describe my problems clearly. I am trying to do some simulation on deformation of an airfoil, before that, I tried to test validity of...

Showing results 1 to 19 of 19

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