# Emergency:udf for moving surface

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 February 9, 2017, 08:56 Emergency:udf for moving surface #1 New Member   fereshte Join Date: Oct 2016 Posts: 4 Rep Power: 2 Hi I need a UDF in fluent for a moving surface with constant velocity and I'm not familiar with code writing . If you already have this UDF , please help me. Sent from my iPhone using CFD Online Forum mobile app

 February 9, 2017, 09:18 #2 Senior Member   Join Date: Nov 2013 Posts: 1,089 Rep Power: 14 Why do you need a UDF for something implemented as a standard boundary condition in Fluent?

February 9, 2017, 09:56
#3
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fereshte
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Quote:
 Originally Posted by pakk Why do you need a UDF for something implemented as a standard boundary condition in Fluent?

This surface has 2 boundary conditions , so one of them is needed to be defined by user

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 February 9, 2017, 09:57 #4 Senior Member   Join Date: Nov 2013 Posts: 1,089 Rep Power: 14 I can not make sense of what you are saying.

February 9, 2017, 10:17
#5
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fereshte
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Quote:
 Originally Posted by pakk I can not make sense of what you are saying.

In fluent you can give only one boundary condition to each surface , my problem is to give two to my surface

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 February 9, 2017, 10:20 #6 Senior Member   Join Date: Nov 2013 Posts: 1,089 Rep Power: 14 Which two boundary conditions are you talking about? 1. moving surface with constant velocity 2. ???

February 9, 2017, 12:20
#7
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fereshte
Join Date: Oct 2016
Posts: 4
Rep Power: 2
Quote:
 Originally Posted by pakk Which two boundary conditions are you talking about? 1. moving surface with constant velocity 2. ???

Velocity inlet

It's a simulation of a drill bit which is moving, and there is a mass flow through its surface at the same time

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