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Simulation of a test setup with a glow plug

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Old   July 28, 2015, 05:34
Default Simulation of a test setup with a glow plug
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Daniel
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Hi!

I'm currently working on an experimental setup consisting on a rectangular pipe with a glow plug perpendicular to its longitudinal axis. I have modelled the glow plug as a cylinder penetrating the fluid with a given surface temperature.

I know the pressure at the inlet and since the velocity is really high, I have used pressure inlet as boundary condition at the inlet and pressure outlet at the exit. The mesh quality is good and it is accurate enough around the cylinder. I'm using a laminar model just to make sure that there is no problem with the mesh and/or the boundary conditions and I am not getting a converged solution.

Could anyone help me?
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Old   July 28, 2015, 20:16
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set the domain to the pressure you are at. Then inlet as mass flow and outlet 0 static average. If you then check in postprocssor, your fluid is at the domain pressure. Or if its gas, you see, the density is acc to the pressure.
It cannot converge, if you set a pressure at the inlet and the outlet, would be overconstrained.
http://www.arc.vt.edu/ansys_help/cfx_mod/i1300679.html
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Last edited by Steffen595; July 29, 2015 at 00:07.
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Old   July 30, 2015, 09:27
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Quote:
Originally Posted by Steffen595 View Post
set the domain to the pressure you are at. Then inlet as mass flow and outlet 0 static average. If you then check in postprocssor, your fluid is at the domain pressure. Or if its gas, you see, the density is acc to the pressure.
It cannot converge, if you set a pressure at the inlet and the outlet, would be overconstrained.
http://www.arc.vt.edu/ansys_help/cfx_mod/i1300679.html
I used the pressure at the inlet and the outlet because I was afraid of having a shocked flow inside the pipe, which would mean that I am not free to select the mass flow rate. I am also trying to solve the problem as you said but it does not converge.
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Old   July 31, 2015, 06:32
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maybe try mass flow in and out, so at least it can adjust the pressure.
did you do mesh inflation?
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