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Reason for Swril and Backflow in Fan Simulation |
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July 2, 2020, 17:04 |
Reason for Swril and Backflow in Fan Simulation
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#1 |
Member
kumar
Join Date: Dec 2019
Posts: 33
Rep Power: 6 |
Hi everyone,
I am trying to Simulate fan in an enclosure of length 500 mm front & behind the fan. incompressible Unsteady simulations boundary conditions: Pressure Inlet and Pressure outlet - 0 gauge pressure (default) Cell zone conditions: Rotating fluid domain with 3000 Rpm as the Continuity is diverging I reduced relaxation factor momentum to 0.4 and KE to 0.4 run simulation for 150 iterations So in the pathlines of flow, I can see the swirl and backflow. as I am new to fan Simulation I have no idea whether they are common in the simulation. If they arent how to solve them in the simulation Thanks in advance |
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July 4, 2020, 11:38 |
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#2 |
Senior Member
Join Date: Jun 2011
Posts: 197
Rep Power: 14 |
try with extended 2x, 3x, 4x computational domain
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November 14, 2020, 17:28 |
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#3 |
Senior Member
Kira
Join Date: Nov 2020
Location: Canada
Posts: 435
Rep Power: 8 |
Backflow is occurring because your domain is not long enough. Try modifying that parameter.
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November 17, 2020, 07:40 |
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#4 |
New Member
Sascha
Join Date: May 2012
Location: Germany
Posts: 14
Rep Power: 14 |
Hi,
swirl and backflow are common behind the fan. Indeed extending your outlet section will help to avoid problems related to backflow, as you are providing more computational domain for the flow to settle, but you can also switch from "Outlet" to "Opening" definition, which will allow backflow. |
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