[jack2]

How does Fluent compute fluid behaviour in very narrow gaps, like hydrodynamic bearings? I'm somewhat familiar with lubrication theory and Reynold's equations. Does Fluent automatically recognize narrow gaps in order to implement these formulas? Or do I need to manually tell Fluent to use them? Is there a general best practice for modeling this sort of thing?

Thanks for your help.

[Mr.Hydrodynamic]

Hey jack2,

I recently started to do some simulating of hydrodynamic tapered-land thrust bearings in fluent (and a little in CFX). It seems that (for the most part) it handles these problems well without any special settings. However, I have noticed that my peak pressures are shifted more towards the middle of the taper and not at the end of taper where it converges with the flat portion (as you would see experimentally). I've been trying to solve this issue for awhile now and I will report back if I come up with a fix. Hoping others can provide some input on your question and perhaps on my problem.

[Cronts]

Fluent models generate fluid in narrow clearances but do not automatically apply lubrication theory. You need to specify settings for laminar flow and use a “thin film” model. Best practices include mesh refinement and validation of results against analytical solutions.