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Self-Propulsion Test in Star CCM+ using Virtual Disk

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Old   March 14, 2021, 09:55
Default Self-Propulsion Test in Star CCM+ using Virtual Disk
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Md Daluar Hussain Sumon
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Hi Dear,
Greetings!!
I am trying to simulate self-propulsion test of a ship model using virtual disk in star ccm+. I have used propeller open water characteristics experimental data as input and specified the propeller rpm. I have defined wave speed using VOF.

For a certain speed, total resistance has quite good agreement with experimental data but the problem is that the longitudinal thrust by virtual disk is very small and it is almost zero. It seems like the virtual disk unable to create thrust. I have followed the star ccm+ body force propeller method tutorial and I think all the inputs are correct.

• What could be the possible reasons for this?

Your prompt reply and help will be highly appreciated.

Thank You!!
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Old   March 16, 2021, 08:47
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Are you using the virtual disk thrust report? You cannot use a standard force report for the virtual disk model.
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Old   March 16, 2021, 10:30
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Quote:
Originally Posted by fluid23 View Post
Are you using the virtual disk thrust report? You cannot use a standard force report for the virtual disk model.
Thank you sir for your reply.
Yes sir, I am using virtual disk thrust report. If this is not the right way for virtual disk model, can you please suggest me how can I obtain the virtual disk thrust ? It would be very helpful for me.

With Best Regards.

Last edited by sumon; March 16, 2021 at 11:42.
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Old   March 16, 2021, 12:42
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It would help if you posted a capture of your report setup and the output.
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Old   March 17, 2021, 02:08
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VD on geomtery.PNG

VD Setup.jpg

Thrust report.jpg

Thrust Monitor.jpg


Dear Sir, here I have attached the captures of virtual disk setup details, report set up and thrust output plot for your kind consideration. Can you please check ?

With Best Regards.
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Old   March 17, 2021, 07:34
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As far as I can tell, it looks like you have this setup correctly. However, there is certainly something in your report setup that is not right. You said that the solution looks correct, except for this one report, right?

I assume you have worked the tutorial example similar to this as well, no? If not, start there. It may help you identify whatever setup issue you have.

If that doesn't solve your problem, and nobody here can help, try to file a support ticket and see if Siemens can figure it out.

Just be prepared to feel like a fool when they point out something obvious. It has happened to me on more than one occasion.

Last edited by fluid23; March 17, 2021 at 10:58.
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