Effective boundary conditions at a regularly microstructured wall

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• Professor Alessandro Bottaro, Univerisity of Genoa
• Friday 06 December 2019, 13:00-14:00
• JDB Seminar Room, CUED..

If you have a question about this talk, please contact Connor O'Pray.

The talk will discuss effective boundary conditions, correct to second order in a small parameter epsilon, for a rough wall with periodic micro-indentations. The length scale of the indentations is l, and epsilon = l/L << 1, with L a characteristic length of the macroscopic problem. At leading order the Navier slip condition is recovered; at next order the slip velocity includes a term arising from the streamwise pressure gradient. At second order also a transpiration velocity appears at the fictitious wall where the effective boundary conditions are enforced. For ease of derivation, the microscopic theory, based on a power series expansion of the dependent variables, will be limited to the case of two- dimensional roughness, the three-dimensional extension being trivial. The application to a macroscopic problem is carried out considering the case of the Hiemenz stagnation point flow over a rough wall.

This talk is part of the Fluids Group Seminar (CUED) series.

This talk is included in these lists:

• Acoustics Lab Seminars
• Engineering Department Acoustics/Combustion Student seminars
• Fluids Group Seminar (CUED)
• JDB Seminar Room, CUED.

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