Changing the global coordinate system?

george85 · September 4, 2011, 17:12

I applied the Point Parameters in Flow Simulation.

I want to change my global coordinate system. I want to move it, so that it is not in the middle of the Point Parameter plain, but at any of the Point Parameters plain corners.
Is that possible?

Can I change it?

Boris_M · September 5, 2011, 03:28

Why do you need this? You can use a local coordinate system if it's just for the values you want to have a certain reference to.

george85 · September 5, 2011, 05:41

Hi Boris.

When I import my data into Tecplot, I get pretty "ugly" coordinate 2d system (x,y). Instead of both axis beginning with 0, and ending with some positive number, both of my axis begin with negative number and end with positive number:

How can I use that local coordinate system i order for my 2d coordinate system in Tecplot to begin with 0?

Boris_M · September 6, 2011, 03:36

Ok, you can create a user defined coordinate system in the reference geometries and use this for the point parameters. By default the coordinates are from the global coordinate system but you can add the parameters from the parameter list. They are called x (cartesian), y ..., z ... and then you have the possibility to select a different coordinate system.

http://imageshack.us/photo/my-images/18/coord.png/

george85 · September 6, 2011, 07:49

Thank you Boris.
Do I need to define a new coordinate system (Insert->Reference Geometry->Coordinate System) before I add the Cartesian X,Y,Z parameters in the Point Parameters list?

For some reason I am getting the same values for both global coordinate system and cartesian:

Why?

Boris_M · September 6, 2011, 08:01

Ok, let me rephrase your question:
Can you get values referenced to a coordinate system that you haven't defined yet?

have a closer look on my image, especially the point parameter settings I did.

george85 · September 6, 2011, 08:57

Makes sense. I am apologizing for asking such a stupid question. Of course I needed to define a new coordinate system first. Sorry.

I had to click on "Global coordinate system" and then click on the newly created "Coordinate system 1". I got it.

Sorry for disturbance, and thank you once again.
I truly owe you a favor!

September 4, 2011, 17:12	Changing the global coordinate system?	#1
george85 Member Join Date: Oct 2010 Posts: 51 Rep Power: 3	I applied the Point Parameters in Flow Simulation. I want to change my global coordinate system. I want to move it, so that it is not in the middle of the Point Parameter plain, but at any of the Point Parameters plain corners. Is that possible? Can I change it?

September 5, 2011, 05:41		#3
george85 Member Join Date: Oct 2010 Posts: 51 Rep Power: 3	Hi Boris. When I import my data into Tecplot, I get pretty "ugly" coordinate 2d system (x,y). Instead of both axis beginning with 0, and ending with some positive number, both of my axis begin with negative number and end with positive number: How can I use that local coordinate system i order for my 2d coordinate system in Tecplot to begin with 0? Last edited by george85; September 5, 2011 at 07:48.

September 6, 2011, 08:57		#7
george85 Member Join Date: Oct 2010 Posts: 51 Rep Power: 3	Makes sense. I am apologizing for asking such a stupid question. Of course I needed to define a new coordinate system first. Sorry. I had to click on "Global coordinate system" and then click on the newly created "Coordinate system 1". I got it. Sorry for disturbance, and thank you once again. I truly owe you a favor! Last edited by george85; September 13, 2011 at 18:18.

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September 5, 2011, 03:28		#2
Boris_M Senior Member Boris Marovic Join Date: Jul 2009 Posts: 146 Rep Power: 4	Why do you need this? You can use a local coordinate system if it's just for the values you want to have a certain reference to.

September 6, 2011, 03:36		#4
Boris_M Senior Member Boris Marovic Join Date: Jul 2009 Posts: 146 Rep Power: 4	Ok, you can create a user defined coordinate system in the reference geometries and use this for the point parameters. By default the coordinates are from the global coordinate system but you can add the parameters from the parameter list. They are called x (cartesian), y ..., z ... and then you have the possibility to select a different coordinate system. http://imageshack.us/photo/my-images/18/coord.png/

September 6, 2011, 07:49		#5
george85 Member Join Date: Oct 2010 Posts: 51 Rep Power: 3	Thank you Boris. Do I need to define a new coordinate system (Insert->Reference Geometry->Coordinate System) before I add the Cartesian X,Y,Z parameters in the Point Parameters list? For some reason I am getting the same values for both global coordinate system and cartesian: Why?

September 6, 2011, 08:01		#6
Boris_M Senior Member Boris Marovic Join Date: Jul 2009 Posts: 146 Rep Power: 4	Ok, let me rephrase your question: Can you get values referenced to a coordinate system that you haven't defined yet? have a closer look on my image, especially the point parameter settings I did.