Unwinding cylinder cut

panasonic18 · November 6, 2020, 13:01

Hey again,

I am doing a CFD analysis of an axial turbomachine. For that I want to unwind a cylindrical cut through the machine, to analyse the flow around the blades.

I have the outer surface of a cylinder and would like to display it unrolled. I already calculated the cylindrical coordinates based on x,y,z:

r = sqrt(y^2+z^2)
Theta = ATAN(z/y)

If I display this in tecplot, the image is distorted.

Does anyone have a better idea?

novedevon · November 6, 2020, 19:11

The best way of doing this is to display an isosurface of theta or R at your desired location. Then extract it, and if necessary switch to R, theta as your axis variables. Or some combination of those steps as required as I'm not 100% clear as to what state your data is currently in.

panasonic18 · November 7, 2020, 16:37

Okay, it worked now. You have to delete the values at the beginning and the end of the cylinder, so plot --> blanking..

But there is my next problem

--> Streamtraces

Is there a possibility to visualise these streamtraces on the new surface? By assgning the coorinates to the vector variable it does not work

.

November 6, 2020, 13:01	Unwinding cylinder cut	#1
panasonic18 New Member Join Date: Jun 2018 Posts: 7 Rep Power: 8	Hey again, I am doing a CFD analysis of an axial turbomachine. For that I want to unwind a cylindrical cut through the machine, to analyse the flow around the blades. I have the outer surface of a cylinder and would like to display it unrolled. I already calculated the cylindrical coordinates based on x,y,z: r = sqrt(y^2+z^2) Theta = ATAN(z/y) If I display this in tecplot, the image is distorted. Does anyone have a better idea?

November 7, 2020, 16:37		#3
panasonic18 New Member Join Date: Jun 2018 Posts: 7 Rep Power: 8	Okay, it worked now. You have to delete the values at the beginning and the end of the cylinder, so plot --> blanking.. But there is my next problem --> Streamtraces Is there a possibility to visualise these streamtraces on the new surface? By assgning the coorinates to the vector variable it does not work . Last edited by panasonic18; November 10, 2020 at 08:08.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[Other] refineWallLayer Error	Yuby	OpenFOAM Meshing & Mesh Conversion	2	November 11, 2021 12:04
How to implement time-varying boundary conditions in an enclosed cylinder	Alejandro-FA	OpenFOAM Pre-Processing	0	May 14, 2020 07:29
[ANSYS Meshing] uniform mesh, cylinder with a cut	Matiasi	ANSYS Meshing & Geometry	5	June 8, 2015 16:08
Forces Acting on a Rotating Cylinder (Moving Mesh)	dreamchaser	CFX	5	April 25, 2015 07:01
Cut a Cylinder and Rotating it.	Ledeeb	FLUENT	0	February 18, 2015 09:38

November 6, 2020, 19:11		#2
novedevon Member Join Date: May 2013 Posts: 61 Rep Power: 13	The best way of doing this is to display an isosurface of theta or R at your desired location. Then extract it, and if necessary switch to R, theta as your axis variables. Or some combination of those steps as required as I'm not 100% clear as to what state your data is currently in.