[hellaadouni]

Hello everyone,

Im working on an horizontal air water confind flow and i need to introduce the air velocity as a parabolic form. Can anyone help me please.
channel length = 3m
Height = 0.15 m
the interface between air water = 0.056m
Since the air is in the upper part of the channel, i didnt know how to right the UDF

[Svetlana]

There is an example at https://www.afs.enea.it/project/nept...df/node243.htm

You may want to follow these steps:

1. Copy formula from the example above, make sure it is along the correct axis and compile, run it and see how it works (the scale and numbers would be wrong but you would see the shape of the velocity profile corresponds to the example)
2. Write maths formula for your desired profile in plain text. If you need help with this then I need a drawing of the geometry with origin location indicated.
3. Write UDF for the desired profile and ensure it works correctly.

Please ask if you have any questions about this.

[hellaadouni]

Originally Posted by Светлана

There is an example at https://www.afs.enea.it/project/nept...df/node243.htm

You may want to follow these steps:

1. Copy formula from the example above, make sure it is along the correct axis and compile, run it and see how it works (the scale and numbers would be wrong but you would see the shape of the velocity profile corresponds to the example)
2. Write maths formula for your desired profile in plain text. If you need help with this then I need a drawing of the geometry with origin location indicated.
3. Write UDF for the desired profile and ensure it works correctly.

Please ask if you have any questions about this.

Hello
I want to thank you for you answer <3
I have another question. Can you please help me?


I'm working on a horizontal air-water confined flow, and I got the slug flow. The problem is when the slug hits the upper part of the channel and blocks the air, this air must return as I think. But it doesn't. Do you have an explanation for this?
I'm sure that the air doesn't return because the air BC is velocity inlet, but I really want to understand where did the air goes once a slug blocks its passage to the outlet?

I'll be grateful if you help me.

Thanks