Learning Forum

[Luna Chen]

Hello everyone,

I am currently simulating a compressor which includes a rotating rotor using the MRF method. Previously, I used version 17.2 for the simulation and the flow field appeared normal. However, with the same settings, the simulation results in version 24 are very strange. There is a significant high-speed flow on the walls, which I believe is not a normal simulation result. Below are my settings. Are there significant differences between version 17 and version 24 for these settings?

Mesh:

• Meshing Element size: 0.8mm
• Face sizing to MRF area: 0.6mm

Fluent setting:

• Steady
• Reynolds stress model
• Frame motion Y = 1, -4850 rev/min

Material:

• R32
• Density: 61.5295 kg/m³
• Viscosity: 1.5923e-05 kg/ms

Boundary conditions:

• Mass Flow inlet: 0.01353 kg/s
• Pressure outlet: 2824315 Pa

Method:

• Coupled

Thank you!

[Essence]

Hello,

Yes, there have been significant improvements in the code since 17.2 version. Please look for viscous models, methods, controls and the materials section.