Flow through hydrostatic bearing

Akhil9611 · July 20, 2020, 06:43

Hello,

I am working on a hydrostatic thrust bearing with a single circular recess. The fluid, ISOVG22 is flowing inside the hydrostatic bearing. I will attach the geometry of the thrust bearing with this email. The fluid is flowing through the inlet at 5m/s, velocity inlet. Circular recess pressure was calculated to be 111300 pa for a 15 mm film thickness. Laminar flow, non-newtonian and in-compressible fluid is assumed. Ambient temperature is neglected. Outlet pressure is 101325 pa. I also want to apply a load of 127.51 N on the top of the bearing surface. A rotational speed of 600rpm is also provided. My end goal is the angular velocity of the fluid in these conditions.

Geometry description : inlet radius = 5mm
recess radius = 50mm
bearing radius = 75mm
As per calculation from MATLAB it was found out that maximum radial velocity for this case is 34.91 m/s. I want to simulate and verify this answer on ANSYS Fluent.
3-D model.jpg

karachun · July 20, 2020, 10:02

So you want someone to make calculations for you?
Well, good luck!

Akhil9611 · July 20, 2020, 11:49

I don't want anyone to do the calculations. I've already done it. I want someone to suggest me how to apply the load on the bearing surface.

karachun · July 20, 2020, 12:33

Use Deforming Mesh and 6DOF solver.
Or you can vary gap (change CAD geometry) and check force on bearing surface.

evcelica · July 23, 2020, 15:58

Alexander is correct.
You can change the CAD geometry, or use a static mesh deformation in CFD Pre to vary your gap thickness.
Use 0 Pa relative pressure on outlet, or make sure you take into account the increased static pressure in your force calculation.
Consider using symmetry or axisymmetric in Fluent.

July 20, 2020, 06:43	Flow through hydrostatic bearing	#1
Akhil9611 New Member Akhil Join Date: Jul 2020 Posts: 3 Rep Power: 6	Hello, I am working on a hydrostatic thrust bearing with a single circular recess. The fluid, ISOVG22 is flowing inside the hydrostatic bearing. I will attach the geometry of the thrust bearing with this email. The fluid is flowing through the inlet at 5m/s, velocity inlet. Circular recess pressure was calculated to be 111300 pa for a 15 mm film thickness. Laminar flow, non-newtonian and in-compressible fluid is assumed. Ambient temperature is neglected. Outlet pressure is 101325 pa. I also want to apply a load of 127.51 N on the top of the bearing surface. A rotational speed of 600rpm is also provided. My end goal is the angular velocity of the fluid in these conditions. Geometry description : inlet radius = 5mm recess radius = 50mm bearing radius = 75mm As per calculation from MATLAB it was found out that maximum radial velocity for this case is 34.91 m/s. I want to simulate and verify this answer on ANSYS Fluent. 3-D model.jpg

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July 20, 2020, 10:02		#2
karachun Senior Member Join Date: Nov 2015 Posts: 247 Rep Power: 12	So you want someone to make calculations for you? Well, good luck!

July 20, 2020, 11:49		#3
Akhil9611 New Member Akhil Join Date: Jul 2020 Posts: 3 Rep Power: 6	I don't want anyone to do the calculations. I've already done it. I want someone to suggest me how to apply the load on the bearing surface.

July 20, 2020, 12:33		#4
karachun Senior Member Join Date: Nov 2015 Posts: 247 Rep Power: 12	Use Deforming Mesh and 6DOF solver. Or you can vary gap (change CAD geometry) and check force on bearing surface.

July 23, 2020, 15:58		#5
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,190 Rep Power: 24	Alexander is correct. You can change the CAD geometry, or use a static mesh deformation in CFD Pre to vary your gap thickness. Use 0 Pa relative pressure on outlet, or make sure you take into account the increased static pressure in your force calculation. Consider using symmetry or axisymmetric in Fluent.