Improved variational principle for bounds on energy dissipation in turbulent shear flow. (English) Zbl 0895.76037
Summary: We extend the Doering-Constantin approach to upper bounds on energy dissipation in turbulent flows by introducing a balance parameter into the variational principle. This parameter governs the relative weight of different contributions to the dissipation rate. Its optimization leads to improved bounds without entailing additional technical difficulties. For plane Couette flow, the high-Re-bounds obtainable with one-dimensional background flows are methodically lowered by a factor of \(27/32\).
MSC:
| 76F10 | Shear flows and turbulence |
| 76M30 | Variational methods applied to problems in fluid mechanics |
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