Dear all,

I do simulation on Ribbed tube but mesh in laminar flow. I get the warning from FLUENT 17

Divergence detected in AMG solver: pressure correction -> Turning off correction scaling!

the details of parameters in below

Laminar flow (Velocity: 0.084193 m/s)

•Working fluid: water liquid

•Internal diameter tube=15.88 mm

•Tube length =8.02 m (7.9 m is entrance region and 0.12 m is the test section)

•Inlet Temperature = 27 C

•Wall Temperature = 17 C

•Reference Temperature = Film Temperature = 22 C

•All Properties are calculated at Film Temperature

I attached mesh.

Thank you

Best regards