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Showing results 1 to 25 of 25 Search took 0.00 seconds. Search: Posts Made By: maddalena

Forum: OpenFOAM Running, Solving & CFD July 21, 2011, 07:42

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena that is the right way of doing things in... that is the right way of doing things in OpenFOAM: sharing experience! thank you to have joined in this thread!

Forum: OpenFOAM Running, Solving & CFD March 10, 2011, 02:36

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Hello, what does this mean? Some time step... Hello, what does this mean? Some time step means after less than 50 time step or after a while? The first cause of solution instability is BC assigned badly. If your solution blows up within 50...

Forum: OpenFOAM Running, Solving & CFD February 9, 2011, 03:19

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Thank you! From my point of view, this is one of the most interesting thread about schemes and convergence of the OF forum! All the suggestions have been demonstrated widely. Indeed, they have been not...

Forum: OpenFOAM Running, Solving & CFD February 8, 2011, 10:00

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena :eek: I hope I can get there one day... :eek: I hope I can get there one day...

Forum: OpenFOAM Running, Solving & CFD February 8, 2011, 03:54

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena No, I did not. The simulation I run uses a... No, I did not. The simulation I run uses a slightly modified version of simpleFoam, for which potentialFoam gives no results. However, all the observations we made yesterday applies without variation...

Forum: OpenFOAM Running, Solving & CFD February 8, 2011, 02:38

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Good morning! I do not thing that the solution... Good morning! I do not thing that the solution is transient. there are lots of vortex forming in the geometry, due to the complex flow path, but all in all I believe that the case is steady state....

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 09:58

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Ok, first results using all you suggested above.... Ok, first results using all you suggested above. I have not get to steady state, but at least I have a sort of solution now. :) All goes fine until some boundary epsilon and k appears. They prevent...

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 08:51

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Ok, that is fine. Seen from a different point of... Ok, that is fine. Seen from a different point of view, this says that using a lower cell number will prevent me to make a long simulation without significant improvement on results. That is...

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 07:37

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Hi Franco, and thanks for your comment. How can I... Hi Franco, and thanks for your comment. How can I set the max iteration number? Is there a missing parameter on my fvSolution where can I set it? Wow, detailed answer on the subject, thanks. V,...

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 05:36

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena That is the best explanation I have had on the... That is the best explanation I have had on the subject up to now. I will try to put it in practice and report my (hopefully good) results. mad

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 05:03

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena and Mmm... these are on the opposite direction... and Mmm... these are on the opposite direction of what suggested by Alberto here (http://www.cfd-online.com/Forums/openfoam-solving/79978-closed-loop-pipe-flow-2.html#post275665). Never reached...

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 04:58

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Hello V, and thank you to join the discussion ... Hello V, and thank you to join the discussion This has been suggested here (http://www.cfd-online.com/Forums/openfoam-solving/81461-pressure-eq-converges-after-few-time-steps.html#post281036) ...

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 04:50

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Yes, I know! That is exactly the point! Yes, I know! That is exactly the point!

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 04:47

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena thank you, however: corrected is extra,... thank you, however: corrected is extra, isn't it? This will no improve the initial convergence, since the solver will stop when the relTol is 0.05. thus it will not run until 1E-12 but stop at...

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 04:15

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Maybe it is worth adding that my mesh is tetra... Maybe it is worth adding that my mesh is tetra mainly. I used prisms in proximity of fans, for the reason explained here...

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 04:00

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Written above. However, I tried different... Written above. However, I tried different combination of them. The log file posted above refers to these two files. mad

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 03:55

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Yes, sure. Here it is. As you can see,... Yes, sure. Here it is. As you can see, something strange happens around time step 17 on Uz. On the contrary, pressure does what explained above.:confused: mad

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 03:42

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Hello, fastest answer ever! No, that is... Hello, fastest answer ever! No, that is standard simpleFoam, thus no internal loop. mad

Forum: OpenFOAM Running, Solving & CFD February 7, 2011, 03:33

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Reversed problem! Ok, maybe this is not the right place where to post, but I hope to get some answer on a problem that is similar to what posted above... I started this thread speaking of a pressure equation that...

Forum: OpenFOAM Running, Solving & CFD December 2, 2010, 10:11

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Why my solutiion is not converging? Hello, still here with the same problem on a different case: pressure & velocity fields look good and their residual's trend is "converging"; however local value of residuals (simpleFoamResidual)...

Forum: OpenFOAM Running, Solving & CFD November 2, 2010, 11:04

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Done. I modified the simpleFoamResidual utility... Done. I modified the simpleFoamResidual utility that hrvoje posted in order to match the new turbulence definition. What I get is a plot showing that the uResidual are higher at the corners of my...

Forum: OpenFOAM Running, Solving & CFD November 2, 2010, 09:53

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Ok, so you need a workmate! I will look into it... Ok, so you need a workmate! I will look into it as well. Stay in touch. mad

Forum: OpenFOAM Running, Solving & CFD November 2, 2010, 09:40

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena That sounds interesting. How can I do that? That sounds interesting. How can I do that?

Forum: OpenFOAM Running, Solving & CFD November 2, 2010, 09:28

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena Thanks Felix and Francesco for your suggestions. ... Thanks Felix and Francesco for your suggestions. Some observations after some more try: That helped a lot. Now I have p and U equations that are solved at every time step. Yes, of course I have a...

Forum: OpenFOAM Running, Solving & CFD October 27, 2010, 11:34

Replies: 69 pressure eq. "converges" after few time steps Views: 25,731 Posted By maddalena pressure eq. "converges" after few time steps Hi everybody, weird simpleFoam convergence over here, need your help! I have a complex pipes geometry, similar to what sketched in the geom.png file. The two main pipes are connected by fans to the...

Showing results 1 to 25 of 25

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