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The structure of wall-pressure fluctuations in turbulent boundary layers with adverse pressure gradient and separation
| Content Provider | Scilit |
|---|---|
| Author | Moin, P. |
| Copyright Year | 1998 |
| Description | Space–time correlations and frequency spectra of wall-pressure fluctuations, obtained from direct numerical simulation, are examined to reveal the effects of pressure gradient and separation on the characteristics of wall-pressure fluctuations. In the attached boundary layer subjected to adverse pressure gradient, contours of constant two-point spatial correlation of wall-pressure fluctuations are more elongated in the spanwise direction. Convection velocities of wall-pressure fluctuations as a function of spatial and temporal separations are reduced by the adverse pressure gradient. In the separated turbulent boundary layer, wall-pressure fluctuations are reduced inside the separation bubble, and enhanced downstream of the reattachment region where maximum Reynolds stresses occur. Inside the separation bubble, the frequency spectra of wall-pressure fluctuations normalized by the local maximum Reynolds shear stress correlate well compared to those normalized by free-stream dynamic pressure, indicating that local Reynolds shear stress has more direct influence on the wall-pressure spectra. Contour plots of two-point correlation of wall-pressure fluctuations are highly elongated in the spanwise direction inside the separation bubble, implying the presence of large two-dimensional roller-type structures. The convection velocity determined from the space–time correlation of wall-pressure fluctuations is as low as $0.33U_{0}$ $(U_{0}$ is the maximum inlet velocity) in the separated zone, and increases downstream of reattachment. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/4065F07298A0680032D1CE15F85AD39F/S0022112098003218a.pdf/div-class-title-the-structure-of-wall-pressure-fluctuations-in-turbulent-boundary-layers-with-adverse-pressure-gradient-and-separation-div.pdf |
| Ending Page | 373 |
| Page Count | 27 |
| Starting Page | 347 |
| ISSN | 00221120 |
| e-ISSN | 14697645 |
| DOI | 10.1017/s0022112098003218 |
| Journal | Journal of Fluid Mechanics |
| Volume Number | 377 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 1998-12-25 |
| Access Restriction | Open |
| Subject Keyword | Journal of Fluid Mechanics Fluids and Plasmas Physics Shear Stress Pressure Gradient Turbulent Boundary Layer Space Time Boundary Layer Spatial Correlation Direct Numerical Simulation |
| Content Type | Text |
| Resource Type | Article |
| Subject | Applied Mathematics Mechanics of Materials Condensed Matter Physics Mechanical Engineering |
