Rotating Arm Simulation

arifvajed · June 21, 2022, 05:15

Hello,
I want to do the rotating arm/ turning circle simulation of underwater vessel on Star CCm to calculate the sway force and yaw moment. I have created a block domain around the model and did polyhedral mesh. I gave all physics conditions. The velocity at domain inlet is zero as only model will be rotating.Now the center of rotation is chosen at a new cordinate system away from model. I chose rotating arm from planar motion mechanism of DFBI in motion. Now when I have run the simulation the model is not rotating around the new cordinate point. Please someone explain whether I am doing the right method or not? And what should I do so that the model rotate in animation.

FliegenderZirkus · June 21, 2022, 09:32

I may be wrong but it sounds like you want to prescribe a circular motion of the body and study the fluid force. If that's the case, you don't need DFBI - a normal overset with prescribed motion should work. DFBI would be needed for the inverse problem - prescribing forces and studying the motion of the body.

arifvajed · June 23, 2022, 14:15

Yes, I want to know the force and moment on the underwater vessel , when it is in circular motion around a fixed axis. If i font need DFBI, how I should do the simulation, what should be the domain look like? And how i should create the overset mesh. Please send me any relates tutorial link

FliegenderZirkus · June 24, 2022, 15:54

How did you define the dfbi from the original post without overset? It sounds like going through the manual and some articles from the support portal on this topic would be the best start.

arifvajed · June 27, 2022, 23:46

Alright sir, Will you send me the links of related articles on support portal, ?? Also if you have done work related to this then send me the star ccm file also plz.

Aeronautics El. K. · June 29, 2022, 17:47

You could do it without DFBI or overset.
You could set the whole domain to rotate around that axis. Inlet velocity should be 0 in that case.
I hope I'm not much mistaken but I think I've done it like that in the past.

arifvajed · July 1, 2022, 15:05

Sir will you please send me some details of your work at my email arifvajed@gmail.com .it will be helpful for me

June 21, 2022, 05:15	Rotating Arm Simulation	#1
arifvajed New Member Join Date: Jun 2022 Posts: 4 Rep Power: 4	Hello, I want to do the rotating arm/ turning circle simulation of underwater vessel on Star CCm to calculate the sway force and yaw moment. I have created a block domain around the model and did polyhedral mesh. I gave all physics conditions. The velocity at domain inlet is zero as only model will be rotating.Now the center of rotation is chosen at a new cordinate system away from model. I chose rotating arm from planar motion mechanism of DFBI in motion. Now when I have run the simulation the model is not rotating around the new cordinate point. Please someone explain whether I am doing the right method or not? And what should I do so that the model rotate in animation.

June 29, 2022, 17:47		#6
Aeronautics El. K. Senior Member Lefteris Join Date: Oct 2011 Location: UK Posts: 341 Rep Power: 16	You could do it without DFBI or overset. You could set the whole domain to rotate around that axis. Inlet velocity should be 0 in that case. I hope I'm not much mistaken but I think I've done it like that in the past. FliegenderZirkus likes this. __________________ Lefteris

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June 21, 2022, 09:32		#2
FliegenderZirkus Member Join Date: Nov 2019 Posts: 98 Rep Power: 7	I may be wrong but it sounds like you want to prescribe a circular motion of the body and study the fluid force. If that's the case, you don't need DFBI - a normal overset with prescribed motion should work. DFBI would be needed for the inverse problem - prescribing forces and studying the motion of the body.

June 23, 2022, 14:15		#3
arifvajed New Member Join Date: Jun 2022 Posts: 4 Rep Power: 4	Yes, I want to know the force and moment on the underwater vessel , when it is in circular motion around a fixed axis. If i font need DFBI, how I should do the simulation, what should be the domain look like? And how i should create the overset mesh. Please send me any relates tutorial link

June 24, 2022, 15:54		#4
FliegenderZirkus Member Join Date: Nov 2019 Posts: 98 Rep Power: 7	How did you define the dfbi from the original post without overset? It sounds like going through the manual and some articles from the support portal on this topic would be the best start.

June 27, 2022, 23:46		#5
arifvajed New Member Join Date: Jun 2022 Posts: 4 Rep Power: 4	Alright sir, Will you send me the links of related articles on support portal, ?? Also if you have done work related to this then send me the star ccm file also plz.

July 1, 2022, 15:05		#7
arifvajed New Member Join Date: Jun 2022 Posts: 4 Rep Power: 4	Sir will you please send me some details of your work at my email arifvajed@gmail.com .it will be helpful for me