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Showing results 1 to 14 of 14 Search took 0.00 seconds. Search: Posts Made By: Bollonga

Forum: FLUENT April 13, 2013, 15:23

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga I created a thread about that, I put the solution... I created a thread about that, I put the solution there. I did an iso-surface on my specified wall zone with mesh variable. ...

Forum: FLUENT April 12, 2013, 10:41

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga Hi everybody, After some days of simulations... Hi everybody, After some days of simulations I haven't made much progress. First I've run the laminar steady case. Increasing the windspeed and rotational speed from 5m/s-10rpm, 10m/s-20rpmand...

Forum: FLUENT April 3, 2013, 10:43

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga I've tried running the case with a more dense... I've tried running the case with a more dense mesh (4 million elements) and convergence is harder to achieve. I had to reduce pressure and momentum URF to their half values and residuals went down....

Forum: FLUENT April 2, 2013, 05:35

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga Double precision rise the same results as single... Double precision rise the same results as single precision. But I made a mistake in the power calculation, it's giving aproximately 10 times less than the experimental data.:( I've also tried to...

Forum: FLUENT April 1, 2013, 10:31

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga Hi everyone, I've run the cases with increased... Hi everyone, I've run the cases with increased windspeed (10 and 15 m/s) keeping the same angle of attack. The mesh is the same and it's still single precision. As I said before, reverse flow has...

Forum: FLUENT March 27, 2013, 15:27

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga Well, I'm running now the same case for U=10m/s.... Well, I'm running now the same case for U=10m/s. Reverse back-flow has disappeared but force and moment coefficient remain so low. 15R downwind is not long enough? I have 15 layers near the...

Forum: FLUENT March 27, 2013, 11:37

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga I've reduced the mesh from 8 to 2 million... I've reduced the mesh from 8 to 2 million elements without changing the y+. Quality>0.2, min angle>18º and volume change <50 (most elements vol change<30) Then I've run the steady laminar case with...

Forum: FLUENT March 26, 2013, 13:56

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga No, I have not. You mean the refinement tool in... No, I have not. You mean the refinement tool in pre-mesh params tab? Gonna check it in the help manual. Now I'm using hyperbolic bunching from 5m at the inlet to 0.25m near the blade and 10m at the...

Forum: FLUENT March 26, 2013, 10:04

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga Yes, it's the mesh around a blade for a 120º... Yes, it's the mesh around a blade for a 120º cylindrical sector (see picture). Blade radius is 29m, blade chord around 1m at the tip, domain extents from 5R in radial direction, 5R upwind and 15...

Forum: FLUENT March 26, 2013, 07:21

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga Exactly, so what does this Courant number means?... Exactly, so what does this Courant number means? There's not too much info in Fluent theory guide.

Forum: FLUENT March 26, 2013, 07:08

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga Well, I need to calculate the blade power. I've... Well, I need to calculate the blade power. I've always used double precision but I don't know if it's strictly necessary here. Can I switch to single precision without risking accuracy? As...

Forum: FLUENT March 26, 2013, 06:51

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga Memory usage is 99% I have 16 Gb RAM My... Memory usage is 99% I have 16 Gb RAM My mesh size is: Total elements : 8250475 Total nodes : 8118741

Forum: FLUENT March 26, 2013, 06:25

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga I've increased URF to 0.75 and it obviously takes... I've increased URF to 0.75 and it obviously takes less to calculate each iteration, but it's still slow (30 min/iteration). Can I increase URF over default values? What about Courant number, how does...

Forum: FLUENT March 25, 2013, 04:39

Replies: 50 Coupled solver, computational cost Views: 32,205 Posted By Bollonga Coupled solver, computational cost Hi everybody guys, I'm solving a wind turbine starting with the steady laminar case and using a pressure-based coupled algorithm. I have a few questions about the setup. I've looked at the...

Showing results 1 to 14 of 14

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