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Experienced negative drag in my foils

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Old   May 11, 2021, 03:46
Default Help: Experienced negative drag in the foils located at the stern
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anson
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The pictures attached are to this issue, more on engineering problem than CFD.

The CFD: KCS vessel + 4 submerged foils, 2 foils at the bow and 2 foils at the stern.

I experienced negative drag on the two foils located at the stern for all my simulations as shown in the Table. And I cannot figure out why. My guess is that the drag force at the stern cancels out by the foils at the bow.

Any suggestion or knowledge on this issue would be a great help.

Thank you CFD users

Warm Regards
Anson
Attached Images
File Type: jpg Drag force table.jpg (50.5 KB, 6 views)
File Type: jpg KCS vessel with foils attached.jpg (199.6 KB, 7 views)

Last edited by ansolution; May 11, 2021 at 05:52.
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