Query regarding Inlet B.C for NASA Rotor37

manpreet · May 11, 2014, 12:15

Hello Everyone.
I am Manpreet, working on project flow analysis through blade passage of NASA Rotor 37. I am using ANSYS CFX for simulation. I put B.C at
inlet: total temp: 288.15 K
Total pressure: 1 Atm (As per literature)

Could anyone please let me know about Flow direction. In cfx there are three options such as
1. Normal to Boundary condition.
2. Cartesian coordinate
3. Cylindrical coordinate.
I did not find form any literature which coordinate system should I use for flow direction. If anyone have idea please let me know. Its urgent.

Thanks and Regards
Manpreet
manpreet_singh_er@yahoo.co.in

ghorrocks · May 11, 2014, 18:22

You choose the boundary condition which matches the condition you are trying to model. And only you know those details of what you are trying to model.

The simple approach is to move the inlet boundary far enough back that a simple normal to boundary condition is acceptable. If you have an inlet close to the region of interest you might need to be more careful to specify a flow direction using one of the other coordinate systems.

May 11, 2014, 12:15	Query regarding Inlet B.C for NASA Rotor37	#1
manpreet New Member Manpreet Join Date: Jan 2014 Posts: 14 Rep Power: 12	Hello Everyone. I am Manpreet, working on project flow analysis through blade passage of NASA Rotor 37. I am using ANSYS CFX for simulation. I put B.C at inlet: total temp: 288.15 K Total pressure: 1 Atm (As per literature) Could anyone please let me know about Flow direction. In cfx there are three options such as 1. Normal to Boundary condition. 2. Cartesian coordinate 3. Cylindrical coordinate. I did not find form any literature which coordinate system should I use for flow direction. If anyone have idea please let me know. Its urgent. Thanks and Regards Manpreet manpreet_singh_er@yahoo.co.in

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May 11, 2014, 18:22		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	You choose the boundary condition which matches the condition you are trying to model. And only you know those details of what you are trying to model. The simple approach is to move the inlet boundary far enough back that a simple normal to boundary condition is acceptable. If you have an inlet close to the region of interest you might need to be more careful to specify a flow direction using one of the other coordinate systems.