twoPhaseEulerFoam inlet velocity

jagan1mohan · June 13, 2020, 09:52

Hello Team, I'm looking to compare twoPhaseEulerFoam (2PEF) and CFDEM setup via simulating minimum fluidization velocity. In CFDEM setup, inlet velocity at the inlet boundary in the simulation is exactly same as we give in U dictionary. That is, I defluidize from 0.6 m/s to 0.0 m/s in 10 secs and functionObject confirms this.

In CFDEM, I use type flowRateInletVelocity; for gas.
In 2PEF, we have type interstitialInletVelocity; and it depends on alpha.air;

Value applied at inlet boundary is very different from one specified in U dictionary.

1. How do we maintain exact gas velocity in 2PEF?

Thank you,
Jagan Mohan.

Ardali · June 13, 2020, 11:46

As I understood, you want to specify time varying inlet velocity for air.
In this case, there are many ways to do so.
The easiest way is using

inlet
{
type uniformFixedValue;
uniformValue table ((0 (0 0.6 0)) (10 ( 0 0 0));
}
double check my syntax.
This boundary decreases the velocity in y-direction from 0.6 to 0 in 10 secs.
Hope it works.
You do not need to change alpha.air. keep the alpha value at inlet 1.
Ardalan

June 13, 2020, 09:52	twoPhaseEulerFoam inlet velocity	#1
jagan1mohan New Member Jagan Mohan Join Date: Dec 2019 Location: New York Posts: 26 Rep Power: 6	Hello Team, I'm looking to compare twoPhaseEulerFoam (2PEF) and CFDEM setup via simulating minimum fluidization velocity. In CFDEM setup, inlet velocity at the inlet boundary in the simulation is exactly same as we give in U dictionary. That is, I defluidize from 0.6 m/s to 0.0 m/s in 10 secs and functionObject confirms this. In CFDEM, I use type flowRateInletVelocity; for gas. In 2PEF, we have type interstitialInletVelocity; and it depends on alpha.air; Value applied at inlet boundary is very different from one specified in U dictionary. 1. How do we maintain exact gas velocity in 2PEF? Thank you, Jagan Mohan.

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June 13, 2020, 11:46		#2
Ardali Member Ardalan Join Date: Jul 2012 Location: Atlanta, USA Posts: 77 Rep Power: 14	As I understood, you want to specify time varying inlet velocity for air. In this case, there are many ways to do so. The easiest way is using inlet { type uniformFixedValue; uniformValue table ((0 (0 0.6 0)) (10 ( 0 0 0)); } double check my syntax. This boundary decreases the velocity in y-direction from 0.6 to 0 in 10 secs. Hope it works. You do not need to change alpha.air. keep the alpha value at inlet 1. Ardalan