Elmer Discussion Forum

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

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...

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

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...

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...

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

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...

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...

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...

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