STAR CCM TUTORIAL ON PIPE FLOW PATCH

STAR CCM TUTORIAL ON PIPE FLOW PATCH

I worry about two aspects of your mesh - the poly mesh in the pipe is wrong since the gradients are all radial and so should be just 3-4 hexa layers using the thin mesher or you could use directed if you manually patch the annulus.Īnd it looks like you have a very fine prism layer and this can cause issues occasionally so i would be starting with a simple 2-3 layer wall function type prism layer rather than a low Rn prism layer and much coarser volume mesh to get the case working then think about refining the mesh.ĭid you try the case with the solid physics removed since this will also give you useful info about where the problems are? I had to divide the 3 parts because only the pipe 2 is heated. Pipe 3: the inlet of the pipe interfaced with the outlet of pipe 2 and has boundary of type wall that is adiabtic the outer wall has a boundary type of wall which is adiabatic the inner wall is interfaced with the fluid wall with an interface of type contact interface and has boundary of type wall that is adiabtic the outlet of the pipe is again adiabatic of type wall.įluid 1: the inlet of the fluid has an imposed mass flow rate the wall is interfaced with the inner wall of pipe 1 and has a boundary of wall type which is adiabatic the oulet is interfaced with the inlet of fluid 2 with an interface of type internal interface and has a boundary of symmetry plane type.įluid 2: the inlet of the fluid has a boundary of symmetry plane type the wall is interfaced with the inner wall of pipe 2 and has a boundary of wall type which is adiabatic the oulet is interfaced with the inlet of fluid 3 with an interface of type internal interface and has a boundary of symmetry plane type.įluid 3: the inlet of the fluid has a boundary of symmetry plane type the wall is interfaced with the inner wall of pipe 3 and has a boundary of wall type which is adiabatic the oulet has a boundary of outlet type. Pipe 2 : the inlet of the pipe interfaced with the outlet of pipe 1 and have boundary of type wall that are adiabtic the outer wall is heated with an imposed heat flux with a wall boundary type the inner wall is interfaced with the fluid wall with an interface of type contact interface and has boundary of type wall that is adiabtic the outlet of the pipe is interfaced with the inlet of pipe 3 with an interface of type contact interface and has boundary of type wall that is adiabtic. Pipe 1: the inlet of the pipe and the outer wall have boundary of type wall that are adiabtic the inner wall is interfaced with the fluid wall with an interface of type contact interface and has a boundary of type wall which is adiabatic the outlet of the pipe is interfaced with the inlet of pipe 2 with an interface of type contact interface and has a boundary of type wall which is adiabatic. The boundary conditions for the pipe are: For the solid part the mesh is a polygonal type and for the fluid I have used also the prism layers. The only problem I can identify in the mesh is the skewness angle for the rest the diagonistic report is fine. I put here the screenshots about the mesh.

What does your mesh look like? hope your using a more efficient extruded meshing method to keep cell numbers down.Īctually for this project it is mandatory to use also the solid so we can't remove it. so remove the physics from the solid and run again.

i doubt this is you problem but it might be causing slow convergence and the temperature issue might go away after some time. solids slow the solution especially if the energy u.r.f. Temperature correction limited- Star ccm+ - CFD Online Discussion Forumsįirstly i notice you might have a solid pipe in your setup and wonder if this is really needed since it is rare to need to add the actual solid and you can instead accurately allow for it in the wall boundary settings including thermal resistance.

Star ccm tutorial on pipe flow