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Recent content by cbrn

  1. cbrn

    water-film bearing with "precompressed" water ?

    > I don't get how Lomakin effect applies with zero eccentricity. Sorry, I called it like that a bit improperly. I wanted to say that Childs derive a solution for anular fluid film with turbulent (high axial Reynolds) flow: anular implies inner and outer borders of the fluid field are coaxial...
  2. cbrn

    water-film bearing with "precompressed" water ?

    Hello all, I've been searching through the net for analytical solutions of the "short bearing with axial flow", thus combining hydrodynamical effect due to rotation and Lomakin effect due to axial flow, for a shaft having an eccentricity "epsilon", but... - sources as D.W. Childs give solutions...
  3. cbrn

    water-film bearing with "precompressed" water ?

    ... oops, sorry, please don't consider my last question, let's reformulate like that: it seems it is not really a matter of pressure (intended as "total pressure") because the total pressure is uniform circumferentially, rather a matter of velocities (and hence static pressures). Axial flow...
  4. cbrn

    water-film bearing with "precompressed" water ?

    Hi, I should have read better the assumptions of Electricpete... I hope I will be able to clarify a little bit: - the labyrinth seal is supposed to behave like a radial bearing (hydrodynamic, no stiffness at zero eccentricity) - there is indeed a strong pressure difference axially between the...
  5. cbrn

    water-film bearing with "precompressed" water ?

    Hi, I agree. I checked your resource and recognized I already saw it in another form. Everything seems to confirm what I originally thought and that you also point on. Thanks! Best regards
  6. cbrn

    calculation of a radial bearing whose fluid medium is pressurized?

    Hi, thanks to all for your attention, and sorry again for the double post. I replied to Electricpete and WCFoiles in the other thread, let's continue the discussion there (Bearing Design forum) so the moderators won't ban me ;-) Thank you again, your comments are very precious for me!
  7. cbrn

    water-film bearing with "precompressed" water ?

    Hi, thank you very much Electricpete and WCFoiles! I'll try to give some more clarifications after your remarks: - the "bearing" I'm talking about is, in fact, a sealing labyrinth. So it's a "cylinder-inside-cylinder" whose external one is the machine stator and the internal one is the runner. -...
  8. cbrn

    calculation of a radial bearing whose fluid medium is pressurized?

    It's in order to maximize the possibility to get an answer in times compatible with the design of this component... knowing that the "Bearings Design" forum is not very active... Sorry, thanks
  9. cbrn

    Hardware recommendation for Ansys 13

    Hi, I don't know if this will answer your needs, but I can only tell the best on the workstations we are using in office: Hp Z800 with 2x Xeon, 8 cores (need 6x HPC licenses to fully use all the cores of all the processors), 24 GB RAM, nVidia Quadro FX3800, 2x 10000rpm HD in Raid striped...
  10. cbrn

    Multi-treaded finite elemental analysis software?

    Hi, all hi-end FEA packages are scalable on any number of processors you want, or so. At least, ANSYS does. And it does in several different ways, so that you can even build computing arrays and solve in remote with dedicated hyper-parallel solvers. It does charge you for all that, though. If...
  11. cbrn

    water-film bearing with "precompressed" water ?

    ... I forgot to mention: it's a radial hydrodynamic bearing, not a thrust bearing. Its geometry is like a "plain shell" cylindrical bearing. Hope this makes things a bit clearer... Regards!
  12. cbrn

    calculation of a radial bearing whose fluid medium is pressurized?

    Hi, I've got a runner-in-housing assembly which behaves kind like a radial bearing, whose fluid medium is water. The fact is that this water is pressurized, i.e. the average pressure inside the "bearing" at rest is not zero. Does this pressure have an influence on the static behavior of the...
  13. cbrn

    water-film bearing with "precompressed" water ?

    Hi, I've got a runner-in-housing assembly which behaves kind like a bearing, whose fluid medium is water. The fact is that this water is pressurized, i.e. the average pressure inside the "bearing" at rest is not zero. Does this pressure have an influence on the static behavior of the bearing...
  14. cbrn

    Primary/Secondary stress or Fatigue analysis

    Hi, combinations are suggested by logic... Can you switch off gravity? I suppose not. So it is a permanent, continuous load. It will be present with full intensity and load multiplier 1. You are dealing with a pressure vessel: where is your pressure load? Is it constant? Can it vary? It will be...
  15. cbrn

    introduction of earthquakes

    Hi, earthquakes are definitely not the simplest task in Ansys (as well as in any other FEA program)... First of all, get a strong knowledge of simple static structural problems. In other words, get used with Ansys in itself. Then, next step depends upon the system you nrrd to analyze: - if it...
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