Stratified liquid in a rotating cylinder

Yohan · January 17, 2018, 03:04

Hello everyone.

I am Yohan, undergraduate student and new to OpenFOAM and CFD.

Recently I am planning to analyze fluid in the rotating cylinder and I encounter some difficulties to ask.

1. My object is to simulate two miscible (initially stratified) two liquids in the rotating cylinder, but I am not sure about which solver would be suit for the case.

I need to use Dynamic mesh, so that I am looking for interDyMFoam or multiphaseInterDyMFoam. Do these solvers include analysis about miscible liquids? Or should I use twoLiquidMixingFoam and modify code to use dynamic mesh?

2. For making a prism layer, I calculated the y+ value based on my knowledge but it comes to quite large value.

I set free stream velocity as radii x angular velocity,
density and dynamic viscosity as lower fluid properties,
boundary layer length as 2pi times radii
and Y+ value as 30.

is it right? or do I have to convert some values on it?

Thanks in advance and have a nice day everyone.!

piu58 · January 17, 2018, 03:56

I don't know if I understand you right. But it may be easiest simulation a fixed volume and a cylinder with moving walls. A very simple example of this you may find in the lid driven cavity example where one of the wall is moving.

I think the interfoam solver would be appropriate for you.

Yohan · January 23, 2018, 05:05

Dear Uwe Pilz,

Thank you for your reply!

Before starting the simulation, I am trying to understand VOF method and mathematical analysis.

It seems to be hard for me now, however I am going to understand according to your advice!

Thank you again!

- Yohan

January 17, 2018, 03:04	Stratified liquid in a rotating cylinder	#1
Yohan New Member Shin Soyong Join Date: Dec 2017 Posts: 8 Rep Power: 8	Hello everyone. I am Yohan, undergraduate student and new to OpenFOAM and CFD. Recently I am planning to analyze fluid in the rotating cylinder and I encounter some difficulties to ask. 1. My object is to simulate two miscible (initially stratified) two liquids in the rotating cylinder, but I am not sure about which solver would be suit for the case. I need to use Dynamic mesh, so that I am looking for interDyMFoam or multiphaseInterDyMFoam. Do these solvers include analysis about miscible liquids? Or should I use twoLiquidMixingFoam and modify code to use dynamic mesh? 2. For making a prism layer, I calculated the y+ value based on my knowledge but it comes to quite large value. I set free stream velocity as radii x angular velocity, density and dynamic viscosity as lower fluid properties, boundary layer length as 2pi times radii and Y+ value as 30. is it right? or do I have to convert some values on it? Thanks in advance and have a nice day everyone.!

January 17, 2018, 03:56		#2
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	I don't know if I understand you right. But it may be easiest simulation a fixed volume and a cylinder with moving walls. A very simple example of this you may find in the lid driven cavity example where one of the wall is moving. I think the interfoam solver would be appropriate for you. __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

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January 23, 2018, 05:05		#3
Yohan New Member Shin Soyong Join Date: Dec 2017 Posts: 8 Rep Power: 8	Dear Uwe Pilz, Thank you for your reply! Before starting the simulation, I am trying to understand VOF method and mathematical analysis. It seems to be hard for me now, however I am going to understand according to your advice! Thank you again! - Yohan