How to set up two phase flow time de

Casper_07 · February 29, 2016, 01:07

Hi everybody,

How to set up two phase flow time dependent boundary conditions in CFX? Gas flows in given time, After given time, other gas flows from opposite side.

-Maxim- · February 29, 2016, 02:45

maybe with an if-expression? use for gas flow: if(your_time_variable>specific_time,new speed of gas flow,old speed of gas flow)

Casper_07 · February 29, 2016, 03:45

You mean CEL expression?

-Maxim- · February 29, 2016, 03:53

yes. A CEL expression can be used to set boundary conditions (inflow rates) etc. Chapter 14.2.2 'conditional if statement' covers the syntax in case my explanation above was too confusing.
For time variables, you could for example use 'ctstep' (current time step) or 'atstep' (accumulated time step)

February 29, 2016, 01:07	How to set up two phase flow time de	#1
Casper_07 New Member Casper Join Date: Nov 2015 Posts: 14 Rep Power: 10	Hi everybody, How to set up two phase flow time dependent boundary conditions in CFX? Gas flows in given time, After given time, other gas flows from opposite side.

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February 29, 2016, 02:45		#2
-Maxim- Senior Member Maxim Join Date: Aug 2015 Location: Germany Posts: 415 Rep Power: 12	maybe with an if-expression? use for gas flow: if(your_time_variable>specific_time,new speed of gas flow,old speed of gas flow)

February 29, 2016, 03:45		#3
Casper_07 New Member Casper Join Date: Nov 2015 Posts: 14 Rep Power: 10	You mean CEL expression?

February 29, 2016, 03:53		#4
-Maxim- Senior Member Maxim Join Date: Aug 2015 Location: Germany Posts: 415 Rep Power: 12	yes. A CEL expression can be used to set boundary conditions (inflow rates) etc. Chapter 14.2.2 'conditional if statement' covers the syntax in case my explanation above was too confusing. For time variables, you could for example use 'ctstep' (current time step) or 'atstep' (accumulated time step)