Unwinding cylinder cut

panasonic18 · November 6, 2020, 12:01

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, 18:11

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, 15:37

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, 12:01	Unwinding cylinder cut	#1
panasonic18 New Member Join Date: Jun 2018 Posts: 7 Rep Power: 7	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, 15:37		#3
panasonic18 New Member Join Date: Jun 2018 Posts: 7 Rep Power: 7	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 07:08.

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November 6, 2020, 18:11		#2
novedevon Member Join Date: May 2013 Posts: 61 Rep Power: 12	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.