Explanation of "Fix Level Set for inflow or outflow"

Kaushik15 · June 13, 2024, 08:11

Greetings. Hope everyone is doing well. I had a question regarding a REEF3D parameter.

What does it mean to fix the level set for inflow or outflow (F 50)? How does this option affect my simulation? Furthermore, what should generally be the value of this parameter in a current only, wave only and a wave-current simulation for scouring?

valgrinda · June 16, 2024, 08:46

Hi Kaushik,

fixing the waterlevel for inflow or outflow is most relevant for open channel flow (B 60 1). Most commonly for these conditions, the inflow should be zero-gradient and the outflow should be fixed.

Kaushik15 · June 17, 2024, 02:12

Thank you for the explanation. Could you please explain what would be the specific cases that would warrant fixing the inflow as well?

valgrinda · June 17, 2024, 02:36

Not really. If the open channel flow simulation is correctly set up, the inflow water level will automatically be correct. The only case I see for fixed inflow water level is for super-critical outflow conditions (then the outflow water level cannot be fixed).

Kaushik15 · June 17, 2024, 02:45

I'm very grateful for your answer. This will help me a lot.

June 13, 2024, 08:11	Explanation of "Fix Level Set for inflow or outflow"	#1
Kaushik15 New Member Kaushik Majumdar Join Date: Jun 2024 Location: Kharagpur, India Posts: 7 Rep Power: 2	Greetings. Hope everyone is doing well. I had a question regarding a REEF3D parameter. What does it mean to fix the level set for inflow or outflow (F 50)? How does this option affect my simulation? Furthermore, what should generally be the value of this parameter in a current only, wave only and a wave-current simulation for scouring? Last edited by Kaushik15; June 13, 2024 at 08:13. Reason: Minor formatting changes.

June 16, 2024, 08:46		#2
valgrinda Super Moderator Hans Bihs Join Date: Jun 2009 Location: Trondheim, Norway Posts: 403 Rep Power: 19	Hi Kaushik, fixing the waterlevel for inflow or outflow is most relevant for open channel flow (B 60 1). Most commonly for these conditions, the inflow should be zero-gradient and the outflow should be fixed. __________________ Hans Bihs Team REEF3D www.reef3d.com

June 17, 2024, 02:36		#4
valgrinda Super Moderator Hans Bihs Join Date: Jun 2009 Location: Trondheim, Norway Posts: 403 Rep Power: 19	Not really. If the open channel flow simulation is correctly set up, the inflow water level will automatically be correct. The only case I see for fixed inflow water level is for super-critical outflow conditions (then the outflow water level cannot be fixed). __________________ Hans Bihs Team REEF3D www.reef3d.com

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June 17, 2024, 02:12		#3
Kaushik15 New Member Kaushik Majumdar Join Date: Jun 2024 Location: Kharagpur, India Posts: 7 Rep Power: 2	Thank you for the explanation. Could you please explain what would be the specific cases that would warrant fixing the inflow as well?

June 17, 2024, 02:45		#5
Kaushik15 New Member Kaushik Majumdar Join Date: Jun 2024 Location: Kharagpur, India Posts: 7 Rep Power: 2	I'm very grateful for your answer. This will help me a lot.