[sumon]

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!!

[fluid23]

Are you using the virtual disk thrust report? You cannot use a standard force report for the virtual disk model.

[sumon]

Originally Posted by fluid23

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.

[fluid23]

It would help if you posted a capture of your report setup and the output.

[sumon]

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.

[fluid23]

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.

[Aeronautics El. K.]

Originally Posted by sumon

Attachment 83355

Attachment 83356

Attachment 83357

Attachment 83358


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.

The virtual disk coordinate system is the Virtual Disc CSys and you have set the normal and coordinate system to be the x axis of the ship coordinate system. So, if the two do not coincide, then your virtual disk rotates about the wrong coordinate system.