How to set velicoty inlet with an angle

Huihua · August 15, 2021, 20:51

Hi guys,

I would like to simulate a 2D problem. My velocity inlet should be 0.25 m/s with an angle of 5 to the normal. I use the 'component' options in the velocity inlet, which means the x component = 0.02179m/s and the y component equal to 0.249m/s.

In my simulation, I would like the velocity component to be a constant. I choose the reference frame to be 'absolute'. But it seemed that ansys gave me a result of moving frame and the track of the inlet fluid looked like a 'rotated' jet. I would like a straight jet with an angle of 5 degree to the normal. Does any one know how to solve it?

Thank you very much for your help.

ranxiaoran · August 19, 2021, 08:59

Why not choose the 'magnitude and direction' item in Velocity Specification Method?

Huihua · August 19, 2021, 14:53

Quote:

Originally Posted by ranxiaoran

Why not choose the 'magnitude and direction' item in Velocity Specification Method?

Actually I think both methods are OK for this simulation.

pakk · August 20, 2021, 14:12

Can you show a picture of your flow field? I don't understand your description of a warped jet...

Huihua · August 23, 2021, 13:32

Quote:

Originally Posted by pakk

Can you show a picture of your flow field? I don't understand your description of a warped jet...

Hi Pack, Thank you for your reply. The picture is attached.

The jet should leave the inlet interface with an angle of 5 to the nominal. But it seems not like that.

BTW, there is a vapor at the top of the model. I thought it might be the existence of the vapor that bounded the jet flow.

jet flow.png

LoGaL · August 23, 2021, 16:02

Hi, from the flow field it seems to me that it is leaving at 5 degrees, but then creates that weird structure. I don’t think there’s a mistake with the velocity inlet BC, there’s something else more fishy going on

August 15, 2021, 20:51	How to set velicoty inlet with an angle	#1
Huihua New Member Huihua Yang Join Date: Aug 2021 Posts: 3 Rep Power: 5	Hi guys, I would like to simulate a 2D problem. My velocity inlet should be 0.25 m/s with an angle of 5 to the normal. I use the 'component' options in the velocity inlet, which means the x component = 0.02179m/s and the y component equal to 0.249m/s. In my simulation, I would like the velocity component to be a constant. I choose the reference frame to be 'absolute'. But it seemed that ansys gave me a result of moving frame and the track of the inlet fluid looked like a 'rotated' jet. I would like a straight jet with an angle of 5 degree to the normal. Does any one know how to solve it? Thank you very much for your help.

August 19, 2021, 08:59	velocity inlet	#2
ranxiaoran New Member iiran Join Date: Jul 2021 Posts: 21 Rep Power: 5	Why not choose the 'magnitude and direction' item in Velocity Specification Method?

August 20, 2021, 14:12		#4
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 26	Can you show a picture of your flow field? I don't understand your description of a warped jet... __________________ "The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform" is NOT the error after compiling. It is the error after loading. To see compiler errors, look at your screen after you click "build".

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August 23, 2021, 16:02		#6
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 375 Rep Power: 12	Hi, from the flow field it seems to me that it is leaving at 5 degrees, but then creates that weird structure. I don’t think there’s a mistake with the velocity inlet BC, there’s something else more fishy going on