Problem with Slender Body mesh in Maxsurf

[Zygan]

Currently trying to evaluate the resistence and power prediction of a multihull using Maxsurf Resistance. Since the length to beam ratio is more than the usual 6-7, I thought of using the slender body method. When I display the default mesh (which usually is more than enough) it doesn't look like anything I would expect. Any tips on the reason to this disaster?

 

[Zygan]

Managed to partially solve the problem. Now, the thing is that the slender body mesh doesn't mirror on the second demihull. Any way to solve this?

 

[Zygan]

attached the .msd file as requested.

 

[TANSL]

This is the SB Mesh I get after deleting symmetrical surfaces. The mesh looks correct.
Attached new file .msd

 

[Zygan]

This is the SB Mesh I get after deleting symmetrical surfaces. The mesh looks correct.
Attached new file .msdView attachment 137632

Wow, much appreciated. Thank you very much.

Sorry but I'm a beginner. What do you mean by deleting symmetrical surfaces? What should I do to avoid this? It's so that I don't get the same problem in the future.

 

[TANSL]

Hope this help

Always try to make the model as simple as possible.

 

[Zygan]

Hope this help
View attachment 137634

Always try to make the model as simple as possible.

So helpful, really really useful. Thank you so much. Hope I don't have to bother you again.

 

[TANSL]

You're welcome. At your disposal for what you need, if it is in my hands. I'll be happy to help you. PM if you need a more confidential conversation.

 

[Zygan]

Thank you, you've been most helpful, I'll PM if necessary.

 

[Sri Hartanto Aji Sasongko]

However, does the same way can be done if the catamaran has asymmetric hull? Or we create the mesh manually? Thanks

 

[TANSL]

The procedure should be the same but, to get rid of doubts, could you show us your hulls?

 

[Sri Hartanto Aji Sasongko]

I make that model from Rhino.

 

[Sri Hartanto Aji Sasongko]

I think there are too many points in that model considering that I just selected all of the object while exporting.

 

[TANSL]

There are too many points, effectively, which makes working with the model very slow. Also some surfaces seem not to be correct. See picture.
Work on Rhino, if you prefer, but try to make the surfaces as simple as possible. Avoid abusing the trim between surfaces. In this forum we have seen frequently that the export from Rhino to MaxSurf can have problems.

 

[Sri Hartanto Aji Sasongko]

Okay. Btw those black lines appear from the IGES. Yes I'm sorry, my bad . but my first model which is the symmetric cat seems ok, probably. I also make that from Rhino -> IGES -> Maxsurf and the meshing result exactly like the discussion above. I just have a problem with asymmetric cat mesh.