sediment scour model, scalars OR mass particles?

ati_ros61 · October 12, 2009, 06:38

I want to model the sedimentation process in a settling tank. I will have some suspended concentration and I want to investigate the settling efficiency in the settling tank. I read the Flow-3d Help file and I see that I should use the sediment scour model, scalars and mass particles together, But I’m not sure about that!

Are these models, good for my purpose or not? And also I found some parameters (e.g. IFDIS(n) and ISCTYP(n) in Namelist FL; ISCOUR1 and ISCOUR2 parameters in the SCALAR namelist) but I don’t know where should I introduce these parameter in GUI.
How can specify the concentration of bed load and suspended load (separately) in initial and boundary conditions.

MuxaB · October 20, 2009, 00:51

Hi Atiieh,

I don't think you should be using particles; they are only good for very low concentrations of sediment. The scour model should be adequate. There is an example test problem in the directory Examples in the installation folder, called 'scour'. It has all the settings you need, including setting the initial packed bed.

In older versions of FLOW-3D you may need to enter much of the stuff into the prepin file using the text editor. Version 9.4 has a new, multi-sediment scour and bed-load transport model. Much easier to use. I hope you can get your hands on it.

Michael

Flowdy · November 17, 2013, 12:17

Hi everyone.
I´m doing exactly what Atiieh was doing some years ago.
I have a problem because THE SEDIMENT CONCENTRATION IN THE TANK SEEMS TO INCREASE WITH NONSTOP. My theory is that just the water is flowing out of the tank but not the sediments. How can I correct that? I need that the water with their respectively concentration of sediments go out of the tank.
The BC of the outlet is volume flow rate or Specified velocity (I can do any of them). I´m working with “sediment Scour model” but not with “Particles model”
Could some please help me?

October 12, 2009, 06:38	sediment scour model, scalars OR mass particles?	#1
ati_ros61 New Member Atiieh Rostami Join Date: Oct 2009 Location: malaysia Posts: 17 Rep Power: 17	I want to model the sedimentation process in a settling tank. I will have some suspended concentration and I want to investigate the settling efficiency in the settling tank. I read the Flow-3d Help file and I see that I should use the sediment scour model, scalars and mass particles together, But I’m not sure about that! Are these models, good for my purpose or not? And also I found some parameters (e.g. IFDIS(n) and ISCTYP(n) in Namelist FL; ISCOUR1 and ISCOUR2 parameters in the SCALAR namelist) but I don’t know where should I introduce these parameter in GUI. How can specify the concentration of bed load and suspended load (separately) in initial and boundary conditions.

October 20, 2009, 00:51		#2
MuxaB Senior Member michael barkhudarov Join Date: Mar 2009 Location: Sante Fe, New Mexico, USA Posts: 337 Rep Power: 18	Hi Atiieh, I don't think you should be using particles; they are only good for very low concentrations of sediment. The scour model should be adequate. There is an example test problem in the directory Examples in the installation folder, called 'scour'. It has all the settings you need, including setting the initial packed bed. In older versions of FLOW-3D you may need to enter much of the stuff into the prepin file using the text editor. Version 9.4 has a new, multi-sediment scour and bed-load transport model. Much easier to use. I hope you can get your hands on it. Michael Flowdy likes this.

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November 17, 2013, 12:17		#3
Flowdy New Member Flowdy Join Date: Nov 2013 Posts: 5 Rep Power: 13	Hi everyone. I´m doing exactly what Atiieh was doing some years ago. I have a problem because THE SEDIMENT CONCENTRATION IN THE TANK SEEMS TO INCREASE WITH NONSTOP. My theory is that just the water is flowing out of the tank but not the sediments. How can I correct that? I need that the water with their respectively concentration of sediments go out of the tank. The BC of the outlet is volume flow rate or Specified velocity (I can do any of them). I´m working with “sediment Scour model” but not with “Particles model” Could some please help me?