Hi group,
I have solved a incompressible navier-stokes simulation (laminar) and the results converged, but it was oscilating until at the end , as show in the figure. why it was occurred? Is it a problem?
Thanks,
Rodrigo
Search found 16 matches
- 11 Jun 2010, 22:09
- Forum: ElmerSolver
- Topic: convergence line oscilating
- Replies: 1
- Views: 1884
- 11 Jun 2010, 21:56
- Forum: ElmerGUI
- Topic: mesh refinement
- Replies: 0
- Views: 3117
mesh refinement
Hi group, Is there a way to refine the mesh only in a specific local of the model? or a kind of adaptive mesh? I have tried to change the max H on the configuration mesh menu, but with that all the mesh was increased and the number of nodes was too high. I'm sending attached a image of my mesh. I wo...
- 11 Jun 2010, 17:46
- Forum: ElmerSolver
- Topic: Turbolence mode with K - e
- Replies: 11
- Views: 9197
Re: Turbolence mode with K - e
Hi Cean,
I think you are right. I tried to find some article or something related about that at the internet and all I read said to set the values for K - e only at the inlet, and use wall function on the fin to get more realism.
Thank you,
regards,
Rodrigo
I think you are right. I tried to find some article or something related about that at the internet and all I read said to set the values for K - e only at the inlet, and use wall function on the fin to get more realism.
Thank you,
regards,
Rodrigo
- 10 Jun 2010, 18:36
- Forum: ElmerSolver
- Topic: Turbolence mode with K - e
- Replies: 11
- Views: 9197
Re: Turbolence mode with K - e
iczajka, thank you, I did not try the tutorial as Shirazbj, but I think I got the idea and can adapt to my case. I still have some doubts and would like to ask for the group. I'm studing a flow passing through a fin at speed ranging of 1 to 10 m\s. My boundary is a square tube of 0,3 mm edge with th...
- 09 Jun 2010, 03:14
- Forum: ElmerSolver
- Topic: Turbolence mode with K - e
- Replies: 11
- Views: 9197
Turbolence mode with K - e
Hi Group, I'm trying to simulate a turbolent flow of water around a fin (Re > 300.000). I have studied the manual and I think The K -e method is suitable for this case (please correct me if I'm wrong), but I have some doubts about the procedure and what boundary properties to put. can this problem b...
- 02 Jun 2010, 02:47
- Forum: ElmerPost
- Topic: How to calculate the forces due the pressure in navier-stoke
- Replies: 16
- Views: 24651
Re: How to calculate the forces due the pressure in navier-stoke
Hi Hamed, Peter,
I was commiting a mistake. I was forgetting to put a command on the sif file. The two procedures described above are exatly what I was looking for.
Thank you very much.
Best regards,
Rodrigo
I was commiting a mistake. I was forgetting to put a command on the sif file. The two procedures described above are exatly what I was looking for.
Thank you very much.
Best regards,
Rodrigo
- 31 May 2010, 17:40
- Forum: ElmerPost
- Topic: How to calculate the forces due the pressure in navier-stoke
- Replies: 16
- Views: 24651
Re: How to calculate the forces due the pressure in navier-stoke
Hi Peter, My doubt is about the results I found. My fin is very similar to a wing, where I have a flat surface on the botton and a curved surface on top. I would like to know the drag and the lift forces generated by the fin when subjected to a water flow (interely submerged in the fluid). The press...
- 30 May 2010, 20:21
- Forum: ElmerPost
- Topic: How to calculate the forces due the pressure in navier-stoke
- Replies: 16
- Views: 24651
Re: How to calculate the forces due the pressure in navier-stoke
Hi Hamed, First I would like to thank you for all explanations and your patience. I'm a Mechanical Engineer, but without knowledge in CFD and you are giving me a good foundation to learn about it. If I understood correctly: The values described in the bars of the post pro image are the relative pres...
- 29 May 2010, 04:25
- Forum: ElmerPost
- Topic: How to calculate the forces due the pressure in navier-stoke
- Replies: 16
- Views: 24651
Re: How to calculate the forces due the pressure in navier-stoke
Hi Hamed, I tried the first metod and apparently it worked very well. The values of pressure and velocity appear to be consistent and two dat files were created, but I will need a litle help to interpret the forces results. Can you help me again? I 'm sending attached the postpro image with the pres...
- 28 May 2010, 18:11
- Forum: ElmerPost
- Topic: How to calculate the forces due the pressure in navier-stoke
- Replies: 16
- Views: 24651
Re: How to calculate the forces due the pressure in navier-stoke
Hi Hamed,
It was a great help!! thank you very much!
I have only one doubt.
Is the sif file that you sent me for a 2D simulation? Because i only saw velocities 1 and 2.
Is it possible use this calculation for a 3D analysis?
Best regards,
Rodrigo
It was a great help!! thank you very much!
I have only one doubt.
Is the sif file that you sent me for a 2D simulation? Because i only saw velocities 1 and 2.
Is it possible use this calculation for a 3D analysis?
Best regards,
Rodrigo