On the Taylor hypothesis in forced unsteady wall flows
Experiments on the modulation characteristics of the wall shear stress longitudinal velocity u and u/u space-time correlations are reported in a forced turbulent channel flow in a wide range of imposed frequencies. The resulting integral and Taylor scale properties are discussed in detail in the low...
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| Veröffentlicht in: | Experiments in fluids 2005-11, Vol.39 (5), p.909-922 |
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| creator | TARDU, Sedat VEZIN, Philippe |
| description | Experiments on the modulation characteristics of the wall shear stress longitudinal velocity u and u/u space-time correlations are reported in a forced turbulent channel flow in a wide range of imposed frequencies. The resulting integral and Taylor scale properties are discussed in detail in the low buffer layer under steady and unsteady flow conditions. It is shown that the small-scale turbulence is sensitive to the imposed unsteadiness since the amplitude and phase of the Taylor length scale vary considerably in the imposed frequency range investigated here. The Taylor hypothesis is acceptably valid in steady and unsteady wall layers just above the low buffer layer. Production and instantaneous pressure gradients are mostly responsible for the deviation of the frozen turbulence-state in the viscous and low buffer sublayers. |
| doi_str_mv | 10.1007/s00348-005-0028-2 |
| format | Article |
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| ispartof | Experiments in fluids, 2005-11, Vol.39 (5), p.909-922 |
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| language | eng |
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| source | SpringerNature Journals |
| subjects | Buffer layers Deviation Exact sciences and technology Flows in ducts, channels, nozzles, and conduits Fluid dynamics Fluid flow Fundamental areas of phenomenology (including applications) Instrumentation for fluid dynamics Modulation Physics Turbulence Turbulent flow Unsteady |
| title | On the Taylor hypothesis in forced unsteady wall flows |
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