wave generation and active wave absorption and DEFINE_ADJUST

shedo · March 1, 2022, 13:13

Hello everyone,
I want to simulate waves by Fluent, however, I am facing trouble in the simulation of my problem, I used to simulate waves by fluent, where I can choose wave theory, wavelength, wave height, and depth of water but I realize that due to reflection of end wall and its impact on inlet boundary, the height of the wave in propagation will increase over the time, so I need a mechanism to absorb wave reflection (the active wave absorption)in the wave flume. therefore, I started the simulated wave by use of UDF, and by use of DEFINE_PROFILE, I simulated my wave.
then I need to modify the velocity at the inlet boundary based on the water surface of the domain (or based on the water surface on the section located for example at 1 m from the inlet) by use of DEFINE_ ADJUST to correct my u_velocity component. I do not know how to do this.
can anyone help me to figure it out?

Indra · March 3, 2022, 08:14

Quote:

Originally Posted by shedo

Hello everyone,
I want to simulate waves by Fluent, however, I am facing trouble in the simulation of my problem, I used to simulate waves by fluent, where I can choose wave theory, wavelength, wave height, and depth of water but I realize that due to reflection of end wall and its impact on inlet boundary, the height of the wave in propagation will increase over the time, so I need a mechanism to absorb wave reflection (the active wave absorption)in the wave flume. therefore, I started the simulated wave by use of UDF, and by use of DEFINE_PROFILE, I simulated my wave.
then I need to modify the velocity at the inlet boundary based on the water surface of the domain (or based on the water surface on the section located for example at 1 m from the inlet) by use of DEFINE_ ADJUST to correct my u_velocity component. I do not know how to do this.
can anyone help me to figure it out?

You can use the numerical beach treatment in fluent to absorb wave reflection.

shedo · March 3, 2022, 13:35

Dear Indra,
I don't want to damp my generated waves I want to absorb only reflected waves, I don't think the numerical beach treatment is beneficial because it damps generated waves too. Or at least I don't know if it is able to absorb only reflected waves in the domain. I would be appreciated it if you have information about it and can tell me?

March 1, 2022, 13:13	wave generation and active wave absorption and DEFINE_ADJUST	#1
shedo New Member sheida Join Date: Mar 2021 Posts: 11 Rep Power: 3	Hello everyone, I want to simulate waves by Fluent, however, I am facing trouble in the simulation of my problem, I used to simulate waves by fluent, where I can choose wave theory, wavelength, wave height, and depth of water but I realize that due to reflection of end wall and its impact on inlet boundary, the height of the wave in propagation will increase over the time, so I need a mechanism to absorb wave reflection (the active wave absorption)in the wave flume. therefore, I started the simulated wave by use of UDF, and by use of DEFINE_PROFILE, I simulated my wave. then I need to modify the velocity at the inlet boundary based on the water surface of the domain (or based on the water surface on the section located for example at 1 m from the inlet) by use of DEFINE_ ADJUST to correct my u_velocity component. I do not know how to do this. can anyone help me to figure it out?

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March 3, 2022, 13:35		#3
shedo New Member sheida Join Date: Mar 2021 Posts: 11 Rep Power: 3	Dear Indra, I don't want to damp my generated waves I want to absorb only reflected waves, I don't think the numerical beach treatment is beneficial because it damps generated waves too. Or at least I don't know if it is able to absorb only reflected waves in the domain. I would be appreciated it if you have information about it and can tell me?