Donut Control Volume: Radial Velocity Profile Extraction

nafiy · February 5, 2016, 04:32

Dear CFD experts, please help me in obtaining the radial velocity profile for the control volume shown below.

The fluid flow is from the outer radius to the inner radius of the donut. One wall (volute wall) is stationary while the other is an impeller wall rotating at 2000RPM.

The plot below shows what I should see from CFD results according to analytical results. The max velocity is skewed towards the stationary wall.

`e` · February 5, 2016, 23:55

A rotational velocity can be applied to boundaries from Define > Boundary Conditions... > Momentum > Wall Motion > Moving Wall and select Rotational under Motion.

nafiy · February 7, 2016, 02:06

Dear e, I understand how to specify the rotation for the moving wall.

However, I am trying to get the velocity profile within the gap after calculations are completed.

`e` · February 8, 2016, 22:06

You can display the radial velocity profile across the gap using the XY Plot (Display > Plots...) and creating a new line from New Surface > Line/Rake... with the coordinates of your gap range. Uncheck "Node Values" to show the cell centred velocities.

February 5, 2016, 04:32	Donut Control Volume: Radial Velocity Profile Extraction	#1
nafiy New Member Join Date: Jan 2016 Posts: 8 Rep Power: 10	Dear CFD experts, please help me in obtaining the radial velocity profile for the control volume shown below. The fluid flow is from the outer radius to the inner radius of the donut. One wall (volute wall) is stationary while the other is an impeller wall rotating at 2000RPM. The plot below shows what I should see from CFD results according to analytical results. The max velocity is skewed towards the stationary wall.

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February 5, 2016, 23:55		#2
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	A rotational velocity can be applied to boundaries from Define > Boundary Conditions... > Momentum > Wall Motion > Moving Wall and select Rotational under Motion.

February 7, 2016, 02:06		#3
nafiy New Member Join Date: Jan 2016 Posts: 8 Rep Power: 10	Dear e, I understand how to specify the rotation for the moving wall. However, I am trying to get the velocity profile within the gap after calculations are completed.

February 8, 2016, 22:06		#4
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	You can display the radial velocity profile across the gap using the XY Plot (Display > Plots...) and creating a new line from New Surface > Line/Rake... with the coordinates of your gap range. Uncheck "Node Values" to show the cell centred velocities.