Vortex Tube Mesh and Simulation in Fluent
 

Iam doing a project in Vortex Tube. I want to model the flow. To do that how should the mesh be?(any advice on this would really be good) And how do i mesh manually in Ansys Mesh. Iam using Workbench Interface for solving in Fluent.
I was not able to generate the temperature difference no matter how many times i try. I tried simulating in Solidworks and Fluent , was completely unsuccessful in my attempt to obtain results.

Modelling in Fluent:-

Dimensions of the model:
Inlet Dia: 4mm
Vortex Tube Dia= 2.5mm
Cold tube dia = 0.84mm
Length of Vortex tube= 125mm

Model: Standard k-e Turbuence model
Solver type: Steady, Pressure based
Fluid: Air(Ideal gas)

Boundary Conditions:
Inlet Pressure= 601325 Pa
Outlet Pressure Cold = 101325 Pa
Outlet Pressure Hot = 101325 Pa
Operating Conditions Pressure= 0 Pa

Turbulent Parameters:
Turbulent Intensity= 10%
Hydraulic Diameters at each Cross-section have been given as input in

Hybrid Initialization has been done

Meshing Details

Sizing: On proximity and curvature
Initially assembly meshing was not at all used but i found very poor quality of elements were being formed, then i tried with assembly meshing there was good increase in quality

Assembly Meshing(Cutcell) has been done to improve element quality

Attached is the mesh image and model images


Any help in this regard is much much appreciated!! I also want to know if the mesh i generated is good or bad?

Other mesh files

I even had a problem while solving in Fluent when i checked the model before calculating the solution which said that there were zones where skewness was greater than 0.98 and i tried to convert it to polyhedral cells. And in a particular zone, the conversion was unsuccessful.

How to rectify this?

How to make a good mesh?!