Hi everybody!
I'm trying to simulate the movement of the air in 2D and I only get errors. I use two physics: laminar flow with heat transfer. I've created a square full of air and I put easy boundary conditions:
-Left edge: 120 ºK
-Right edge: 300 ºK
-Top side and down side have thermal insulation and don't have any loss of heat.
The square is closed and it hasn't got inflows or outflows.
I have used a lot of different volume forces: Boussinesq approximation, a reference density...However I think the best idea is to put F=g_const*spf.rho.
I saw Buoyancy Flow in Free Fluids in Model Gallery and followed every step though it uses adimensional parameters and I want to draw on the material library using air properties. I've noticed that when I use a liquid instead of the air all works properly, I think it is due to the viscosity. I use a parametric sweep starting on a value of viscosity which doesn't give any error and decreasing it until the real air's viscosity.
I get a solution with this parametric sweep but I'm sure it's erroneous because I get the values of total heat flux according to each value of viscosity and they aren't the same on the right edge than on the left edge and they must be. However when the viscosity have high values, the total heat flux are the same.
The mesh I use is finer and the study is stationary.
I'm so frustrated because it should be really simple.
Sorry for my English level and thank you for your time.
I'm trying to simulate the movement of the air in 2D and I only get errors. I use two physics: laminar flow with heat transfer. I've created a square full of air and I put easy boundary conditions:
-Left edge: 120 ºK
-Right edge: 300 ºK
-Top side and down side have thermal insulation and don't have any loss of heat.
The square is closed and it hasn't got inflows or outflows.
I have used a lot of different volume forces: Boussinesq approximation, a reference density...However I think the best idea is to put F=g_const*spf.rho.
I saw Buoyancy Flow in Free Fluids in Model Gallery and followed every step though it uses adimensional parameters and I want to draw on the material library using air properties. I've noticed that when I use a liquid instead of the air all works properly, I think it is due to the viscosity. I use a parametric sweep starting on a value of viscosity which doesn't give any error and decreasing it until the real air's viscosity.
I get a solution with this parametric sweep but I'm sure it's erroneous because I get the values of total heat flux according to each value of viscosity and they aren't the same on the right edge than on the left edge and they must be. However when the viscosity have high values, the total heat flux are the same.
The mesh I use is finer and the study is stationary.
I'm so frustrated because it should be really simple.
Sorry for my English level and thank you for your time.