Delta Pressure for Cooling fan Simulation

Gkchpa · April 16, 2020, 05:58

Hi everyone I am simulating Automotive cooling fan (CFD) which will proceed to aeroacoustic prediction. I am a little bit confused giving boundary conditions Inlet velocity - mass flowrate
outlet -pressure
as it is a cooling fan there is delta pressure resulted by the radiator, how to add it into the simulation in Ansys Fluent any suggestion

Thank you

Best regards

tas38 · April 16, 2020, 06:36

For such a simulation, you could specify the total pressure at the inlet and the static pressure at the outlet. With relatively low speed air flow, the dynamic pressure component will be comparatively small and the static pressure drop will be nearly the same as the difference between the inlet total pressure and the outlet static pressure.

Alternatively, you could specify the mass flow at the inlet. The initial value would only be approximate but could then be adjusted until the desired pressure drop is achieved.

Gkchpa · April 16, 2020, 15:37

thank you for the reply, what if I take Massflowrate as the outlet Boundary condition and inlet some velocity, any suggestion in this case, Is it sensible to give both Massflowrate and pressure as BC ?

April 16, 2020, 05:58	Delta Pressure for Cooling fan Simulation	#1
Gkchpa Member kumar Join Date: Dec 2019 Posts: 33 Rep Power: 6	Hi everyone I am simulating Automotive cooling fan (CFD) which will proceed to aeroacoustic prediction. I am a little bit confused giving boundary conditions Inlet velocity - mass flowrate outlet -pressure as it is a cooling fan there is delta pressure resulted by the radiator, how to add it into the simulation in Ansys Fluent any suggestion Thank you Best regards

April 16, 2020, 06:36		#2
tas38 Senior Member Troy Snyder Join Date: Jul 2009 Location: Akron, OH Posts: 219 Rep Power: 18	For such a simulation, you could specify the total pressure at the inlet and the static pressure at the outlet. With relatively low speed air flow, the dynamic pressure component will be comparatively small and the static pressure drop will be nearly the same as the difference between the inlet total pressure and the outlet static pressure. Alternatively, you could specify the mass flow at the inlet. The initial value would only be approximate but could then be adjusted until the desired pressure drop is achieved. Gkchpa likes this.

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April 16, 2020, 15:37		#3
Gkchpa Member kumar Join Date: Dec 2019 Posts: 33 Rep Power: 6	thank you for the reply, what if I take Massflowrate as the outlet Boundary condition and inlet some velocity, any suggestion in this case, Is it sensible to give both Massflowrate and pressure as BC ?