heat transfer and fluid flow problem with density = f(T)
Posted: 16 May 2013, 19:13
Well... i have a question about a problem occuring in my simulation... sometimes it happens and sometimes no! In this one; it appears so...
I am simulating a welding process with the heat transfer and navier stokes solvers.
If i use a temperature dependent density ... the system is totally unstable since the first iteration (i tried step time from 0.5 to 0.005s).
If i use a constant density it works!!!!!
FOr running it, compile the fortran file before. The mesh was obtained with gmsh. I use 1st order polynom for the FEM.
I may have forgotten some of my basis in simulating fluid dynamics.
What i don't understand is that i have a meshgrid that works perfectly with the temeprature dependent density... exactly the same... i have the same sif file... but doesn't work. I just wanted to increase the fluid domain in order to simulate a larger weld pool?
It seems that the pressure at the first iteration takes large values... and i don't see how to fix it...
Brief.. if somebody has a clue of my mistake?
cheers
I am simulating a welding process with the heat transfer and navier stokes solvers.
If i use a temperature dependent density ... the system is totally unstable since the first iteration (i tried step time from 0.5 to 0.005s).
If i use a constant density it works!!!!!
FOr running it, compile the fortran file before. The mesh was obtained with gmsh. I use 1st order polynom for the FEM.
I may have forgotten some of my basis in simulating fluid dynamics.
What i don't understand is that i have a meshgrid that works perfectly with the temeprature dependent density... exactly the same... i have the same sif file... but doesn't work. I just wanted to increase the fluid domain in order to simulate a larger weld pool?
It seems that the pressure at the first iteration takes large values... and i don't see how to fix it...
Brief.. if somebody has a clue of my mistake?
cheers