Elmer Discussion Forum

Hi everybody, I would like to simulate the interaction between a liquid (oil) and a gas (air) in a pressure vessel. This vessel is assumed to have an inlet and an outlet at the bottom where I apply BC to oil. Oil is subjected to time dependent pressure. I have managed to run a simulation without air...

Hi, everybody. I think I have solved the problem, it is related to having loaded any non standard DEFINITION (File->Definitions->Append -> ***.xml). If you load any of them, you firstly need to reload it in order to have the project correctly resumed. Usually I save the whole bunch of definitions wi...

Hi everybody, I am experiencing data loss in saving and reloading projects. When I load a saved project I see geometry and mesh but all other conditions are lost (equations, BC, materials...). It seems the same problem described here (I have installed the latest version 27/03/2015) http://www.elmerf...

Hi everybody, sometime I came up with a new question; thank you in advanced for replying. Assume I have a BC with this kind of trend: constant for the first part and decreasing as exp in the second part. See the picture for better understanding; where x is the z axis in ELMER [tx(2)] and y is the te...

Hi all, after several attempts I managed getting convergence in the steady state. Effectively I need tighter convergenze tolerance for the heat field over the handle (real aim of the simulation) so I decided relax a lot convergence for N-S. Now I would like to implement a turbulent model in the simu...

Hi ...Having convection changes the equation from linear to nonlinear. What is your Re number? The whole field of turbulence modeling is a result of the convection term so this is not a simple question... Peter Hi, you're right whatever is Re (from 400 to 2000 according to Boundary condition) it is...

Hi, keeping the post alive...
Could someone tell me why I cannot get convergence activating "convect" in N-S equation?
To me this seems a quite simple simulation.
Please, help me.

Regards.

... Actually as you have specified "NS Convect=False" (?) ... Hi Juha, thanks for these useful information. I had to disable convection in NS because if I set it to true I do not get convergence, so, being this simulation dominated by forced convection (initial flow field) I thought I cou...

Hi You need to solve the N-S equation before the heat equation, or rather iteratively, to have an effect. If your radiating BC is open you really need to specify the external temperature for the part that is open. If it is closed remove the keyword. -Peter For the "Heat and Flow" equation...

Hi everybody, let's assume I have the following problem: one cylinder is run over by hot air coming from the bottom (forced convection) and dissipating energy through radiation and (maybe) natural convection from the top of it. The cylinder is stainless steel so we have to assume there could be an h...