swirlFlowRateInletVelocity or cylindricalInletVelocity for CPU Axial fan simulation ?

vs11 · August 28, 2017, 05:24

Hi All,

swirlFlowRateInletVelocity or cylindricalInletVelocity boundary condition for CPU Axial fan for an electronics cooling simulation ? I wish to generate swirling flow inlet without using Rotation zones in steady state simulation.

tomf · August 29, 2017, 05:03

Hi,

The cylindricalInletVelocity radial, axial and swirl components. The swirlInletVelocity only allows axial and swirl components.

They both are uniform over the entire patch which may mean you introduce an error compared to the actual axial fan flow field.

Regards,
Tom

vs1 · August 29, 2017, 05:14

Thanks tom, then what else is the best possible way to simulate without error?

tomf · August 29, 2017, 05:32

Well it is always including more detail/physics, so for instance first to run steady-state including the fan (MRF zone), and maybe even run a dynamic mesh with the rotation, but it all depends on the level of detail required and the available resources.

August 28, 2017, 05:24	swirlFlowRateInletVelocity or cylindricalInletVelocity for CPU Axial fan simulation ?	#1
vs11 New Member vs Join Date: Jul 2017 Posts: 3 Rep Power: 9	Hi All, swirlFlowRateInletVelocity or cylindricalInletVelocity boundary condition for CPU Axial fan for an electronics cooling simulation ? I wish to generate swirling flow inlet without using Rotation zones in steady state simulation.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
axial fan bc	leinad	OpenFOAM Pre-Processing	1	July 17, 2015 11:40
Fan Curve Model with CHT simulation	mariconeagles96	CFX	5	April 22, 2015 02:31
MRF Solver fan simulation - problem	sivakumar	FLUENT	0	February 15, 2013 04:26
Simulation and Optimisation of centrifugal fan 3D to 2D	eRzBeNgEl	STAR-CCM+	0	January 31, 2013 14:21
Fan simulation divergence	ayothicfd	CFX	18	July 20, 2012 06:53

August 29, 2017, 05:03		#2
tomf Senior Member Tom Fahner Join Date: Mar 2009 Location: Breda, Netherlands Posts: 647 Rep Power: 32	Hi, The cylindricalInletVelocity radial, axial and swirl components. The swirlInletVelocity only allows axial and swirl components. They both are uniform over the entire patch which may mean you introduce an error compared to the actual axial fan flow field. Regards, Tom

August 29, 2017, 05:14		#3
vs1 New Member vaibhav Join Date: Sep 2016 Posts: 15 Rep Power: 10	Thanks tom, then what else is the best possible way to simulate without error?

August 29, 2017, 05:32		#4
tomf Senior Member Tom Fahner Join Date: Mar 2009 Location: Breda, Netherlands Posts: 647 Rep Power: 32	Well it is always including more detail/physics, so for instance first to run steady-state including the fan (MRF zone), and maybe even run a dynamic mesh with the rotation, but it all depends on the level of detail required and the available resources.