The effectiveness of riblets in reducing friction drag has been well assessed by many experiments in flat plate flow in the end of the last century. Both theory and experiments showed that the effect of riblets only depends on the local Reynolds number, however some experiments in pressure gradient flow showed increased effectiveness of riblets. This effects are still debated because a physical motivation on the effect of riblets on form drag was not provided. In the present paper a numerical method for riblets simulation at high Reynolds numbers is presented and the effect of riblets on form drag is discussed providing a contribution to clarify the origin of this second-order but significant effect.
Riblets and form drag
Mele B.
;
2020-01-01
Abstract
The effectiveness of riblets in reducing friction drag has been well assessed by many experiments in flat plate flow in the end of the last century. Both theory and experiments showed that the effect of riblets only depends on the local Reynolds number, however some experiments in pressure gradient flow showed increased effectiveness of riblets. This effects are still debated because a physical motivation on the effect of riblets on form drag was not provided. In the present paper a numerical method for riblets simulation at high Reynolds numbers is presented and the effect of riblets on form drag is discussed providing a contribution to clarify the origin of this second-order but significant effect.Pubblicazioni consigliate
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