Initial Condition Velocity vs Inlet Velocity

aerospaceart · April 17, 2016, 22:29

Hey guys,

Im currently learning STAR-CCM+ and had a question regarding velocity. I have searched for this question but I have been unable to find an answer.

I wanted to know what the difference is between the velocity specified in the initial conditions of the physics continua branch and the velocity specified in the physics values in the Inlet - Boundaries - Regions branch.

Thanks

kguntur · April 18, 2016, 01:05

the velocity specified in the initial conditions is the initial velocity that is applied on the whole domain. This is what the CFD calculation starts from.
The one specified at the boundary is the boundary condition. This is what typically drives your flow.
To know the difference between initial condition and boundary condition, i would suggest you read any CFD text book.

aerospaceart · April 19, 2016, 01:32

Thank you for your response. Yes, I am currently reading a CFD textbook while learning the STAR-CCM+ software.

April 17, 2016, 22:29	Initial Condition Velocity vs Inlet Velocity	#1
aerospaceart New Member b Join Date: Apr 2016 Location: CANADA Posts: 2 Rep Power: 0	Hey guys, Im currently learning STAR-CCM+ and had a question regarding velocity. I have searched for this question but I have been unable to find an answer. I wanted to know what the difference is between the velocity specified in the initial conditions of the physics continua branch and the velocity specified in the physics values in the Inlet - Boundaries - Regions branch. Thanks

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April 18, 2016, 01:05		#2
kguntur Member kris Join Date: May 2014 Posts: 73 Rep Power: 11	the velocity specified in the initial conditions is the initial velocity that is applied on the whole domain. This is what the CFD calculation starts from. The one specified at the boundary is the boundary condition. This is what typically drives your flow. To know the difference between initial condition and boundary condition, i would suggest you read any CFD text book.

April 19, 2016, 01:32		#3
aerospaceart New Member b Join Date: Apr 2016 Location: CANADA Posts: 2 Rep Power: 0	Thank you for your response. Yes, I am currently reading a CFD textbook while learning the STAR-CCM+ software.