a function of the local time-averaged shear rate

W.Yan · April 11, 2019, 01:14

I carried out a transient simulation in CFX.

I add an additional variable whose model is transport equation, and its kinematic diffusivity is a function of local time-averages shear rate.

I am confused about the local time-averages shear rate for a long time. I have no idea how to get it.

I have tried to replace it with the local shear rate, but the result is terrible.

Is there anyone know how to get local time-averages shear rate or give me some suggustion?

Thank You

Opaque · April 11, 2019, 13:23

Are you aware of the possibility of using something like

MyVariable = Shear Strain Rate.Transient Average ?

Of course, to access such variable you must define the transient average first, and the appropriate averaging window/range.

You should refer to the CFX-Pre Users Guide/Output Control/Transient Statistics to see how to define the quantity of interest.

April 11, 2019, 01:14	a function of the local time-averaged shear rate	#1
W.Yan New Member Yan Wang Join Date: Jan 2019 Posts: 6 Rep Power: 7	I carried out a transient simulation in CFX. I add an additional variable whose model is transport equation, and its kinematic diffusivity is a function of local time-averages shear rate. I am confused about the local time-averages shear rate for a long time. I have no idea how to get it. I have tried to replace it with the local shear rate, but the result is terrible. Is there anyone know how to get local time-averages shear rate or give me some suggustion? Thank You

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April 11, 2019, 13:23		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,820 Rep Power: 32	Are you aware of the possibility of using something like MyVariable = Shear Strain Rate.Transient Average ? Of course, to access such variable you must define the transient average first, and the appropriate averaging window/range. You should refer to the CFX-Pre Users Guide/Output Control/Transient Statistics to see how to define the quantity of interest.