Vented Brake Rotor

neilth · April 30, 2011, 03:55

]I am modelling a vented brake rotor in CFX in ANSYS 13.0. As advised in an ANSYS tutorial my model has three domains: a solid encased in a 1mm film of air that also fills the passages between the rotor faces that rotate together and are both surrounded by a large block of air moving in the axial direction. The problem is that the air does not flow between the two fluid domains (fluid-fluid interface) once the disc is in motion despite how much external air is channeled toward the entry ends of the vanes i.e. the air is not flowing through the ventilation passages.

ghorrocks · April 30, 2011, 06:45

Sounds like a basic problem with the rotating frames of reference setup and/or the GGI interface. Build the model up set by step, maybe first with everything stationary and check that works before adding rotation.

neilth · May 9, 2011, 00:04

I have rebuilt the model step by step. The frame change/mixing model is Transient Rotor Stator. The mesh connection is GGI. Both the rotor and internal air are set as rotating Domain Motion.
There still appears to be no flow through the rotor passages. There is pressure on the lead face of the passages which I presume is from the rotational forces, not the centrifugal forces that should be coming from the vanes of the rotor.

April 30, 2011, 03:55	Vented Brake Rotor	#1
neilth New Member Neil Heilemann Join Date: Apr 2011 Posts: 6 Rep Power: 14	]I am modelling a vented brake rotor in CFX in ANSYS 13.0. As advised in an ANSYS tutorial my model has three domains: a solid encased in a 1mm film of air that also fills the passages between the rotor faces that rotate together and are both surrounded by a large block of air moving in the axial direction. The problem is that the air does not flow between the two fluid domains (fluid-fluid interface) once the disc is in motion despite how much external air is channeled toward the entry ends of the vanes i.e. the air is not flowing through the ventilation passages. Last edited by neilth; April 30, 2011 at 06:07.

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April 30, 2011, 06:45		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,701 Rep Power: 143	Sounds like a basic problem with the rotating frames of reference setup and/or the GGI interface. Build the model up set by step, maybe first with everything stationary and check that works before adding rotation.

May 9, 2011, 00:04		#3
neilth New Member Neil Heilemann Join Date: Apr 2011 Posts: 6 Rep Power: 14	I have rebuilt the model step by step. The frame change/mixing model is Transient Rotor Stator. The mesh connection is GGI. Both the rotor and internal air are set as rotating Domain Motion. There still appears to be no flow through the rotor passages. There is pressure on the lead face of the passages which I presume is from the rotational forces, not the centrifugal forces that should be coming from the vanes of the rotor.