[Jiricbeng]

Hi there,

I encountered the following issue:
I am simulating a radial bearing. The geometry is simple: cylindrical region with radially shifted inner wall to obtain eccentricity. This region includes inlet pipe. All meshed together in ICEM as hexa mesh.

Based on theory for given shaft speed and lubrication gap, the radial force is independent on density, because pressure force and viscous force are dominant, thus density goes away.

This behaviour was confirmed in Fluent, I computed density 1000 kg/m3, 1 kg/m3 and 0.0001 kg/m3, and the force (Fx^2 + Fy^2)^0.5 is almost same, the results deviate negligibly.
But when computing this in CFX, I have different results for density 1000 and 1. The difference is more than 200%-300%.. !! The results however get closer for density 1 and 0.0001.

I verified the influence of reference pressure and others.... no idea yet.

Computations run in CFX and Fluent are as follows: double precision, laminar, incompressible, isothermal, isoviscous...

Thanks a lot..