Rotating Regions in Star CCM+

HenryS · December 18, 2016, 15:29

Hi Guys,

Final year Mechanical Engineering Masters student here with some much needed advice! I've been using Star CCM+ for a year or so now and I have an assignment due in about a month. Its a simple assignment although work beyond the brief in encouraged so I'm looking to go slightly above whats required.

Waffle over:: I'm looking to simulate a bicycle wheel moving forward within a wind tunnel, and provide force reports for both with and without the covers that some racing bikes have. The real assignment is mesh analysis which is pretty straightforward but I'm struggling getting the inital setup to work.

I know how to set up the rotating reference frame and apply it to the relevant region however its setting up the regions I'm struggling with. I've tried importing just the wheel and doing a boolean subtraction from a box created in SCCM+ after meshing the parts however obviously this deletes the wheel region after the boolean subtraction so I have nothing to apply the rotation and translation to. I've tried duplicating a single part, consisting of the wheel subtracted from a box all made in SolidWorks, and then creating one region of just the wheel from the inital part, and another region of the box from the duplicated part. On meshing "computer says no" and I'm getting 'Attempt to access GlobalCommunicator in serial' error warning.

Where am I going wrong? This could be an interface issue as I'm not 100% on that either. Basically I'm asking how to import and set up the geometry and regions for a moving wheel inside a tunnel. If anyone has any words of wisdom I'd be much appreciated. Merry Christmas!

me3840 · December 19, 2016, 01:33

You likely encountered a bug with the error you have there. Are you meshing in parallel or serial? What kind of mesh? What version?

When you are doing the boolean subtract and the wheel is disappearing, I'm assuming then you're doing the subtract in 3D-CAD. There's an option you can tick to keep the tool part which will not delete it.

HenryS · December 19, 2016, 19:13

Thanks for the reply - I've found making two seperate meshes and applying one to the wheel and one to the wind tunnel has fixed it. Thanks again

December 18, 2016, 15:29	Rotating Regions in Star CCM+	#1
HenryS New Member Henry Skrine Join Date: Dec 2016 Posts: 2 Rep Power: 0	Hi Guys, Final year Mechanical Engineering Masters student here with some much needed advice! I've been using Star CCM+ for a year or so now and I have an assignment due in about a month. Its a simple assignment although work beyond the brief in encouraged so I'm looking to go slightly above whats required. Waffle over:: I'm looking to simulate a bicycle wheel moving forward within a wind tunnel, and provide force reports for both with and without the covers that some racing bikes have. The real assignment is mesh analysis which is pretty straightforward but I'm struggling getting the inital setup to work. I know how to set up the rotating reference frame and apply it to the relevant region however its setting up the regions I'm struggling with. I've tried importing just the wheel and doing a boolean subtraction from a box created in SCCM+ after meshing the parts however obviously this deletes the wheel region after the boolean subtraction so I have nothing to apply the rotation and translation to. I've tried duplicating a single part, consisting of the wheel subtracted from a box all made in SolidWorks, and then creating one region of just the wheel from the inital part, and another region of the box from the duplicated part. On meshing "computer says no" and I'm getting 'Attempt to access GlobalCommunicator in serial' error warning. Where am I going wrong? This could be an interface issue as I'm not 100% on that either. Basically I'm asking how to import and set up the geometry and regions for a moving wheel inside a tunnel. If anyone has any words of wisdom I'd be much appreciated. Merry Christmas!

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December 19, 2016, 01:33		#2
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 25	You likely encountered a bug with the error you have there. Are you meshing in parallel or serial? What kind of mesh? What version? When you are doing the boolean subtract and the wheel is disappearing, I'm assuming then you're doing the subtract in 3D-CAD. There's an option you can tick to keep the tool part which will not delete it.

December 19, 2016, 19:13		#3
HenryS New Member Henry Skrine Join Date: Dec 2016 Posts: 2 Rep Power: 0	Thanks for the reply - I've found making two seperate meshes and applying one to the wheel and one to the wind tunnel has fixed it. Thanks again