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Turbulent boundary-layer wall-pressure fluctuations on smooth and rough walls
| Content Provider | Scilit |
|---|---|
| Author | Blake, William K. |
| Copyright Year | 1970 |
| Description | Turbulent boundary-layer wall-pressure measurements were made with ‘pinhole’ microphones three times smaller (relative to a boundary-layer displacement thickness) than microphones used in earlier work. The improved high-frequency resolution permitted examination of the influence of high-frequency eddies on smooth-wall pressure statistics. It was found that the space-time decay rate is considerably higher than previously reported. Measurements of cross-spectral density made with 5 Hz bandwidth filters disclosed low phase speeds at low frequency and small separation. Measurements were repeated on rough walls and parallels were drawn from knowledge of a smooth-wall boundary-layer structure to propose a structure for a rough-wall boundary layer. The effect of independently varying roughness height and separation on the large and small-scale turbulence structure was deduced from the measurements. It was found that roughness separation affected the very large-scale structure, whereas the roughness height influenced the medium and very small-scale turbulence. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/0E2B2FE409F9C2C14C779F65F748480F/S0022112070002069a.pdf/div-class-title-turbulent-boundary-layer-wall-pressure-fluctuations-on-smooth-and-rough-walls-div.pdf |
| Ending Page | 660 |
| Page Count | 24 |
| Starting Page | 637 |
| ISSN | 00221120 |
| e-ISSN | 14697645 |
| DOI | 10.1017/s0022112070002069 |
| Journal | Journal of Fluid Mechanics |
| Issue Number | 04 |
| Volume Number | 44 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 1970-12-01 |
| Access Restriction | Open |
| Subject Keyword | Journal of Fluid Mechanics Fluids and Plasmas Physics Turbulent Boundary Layer |
| Content Type | Text |
| Resource Type | Article |
| Subject | Applied Mathematics Mechanics of Materials Condensed Matter Physics Mechanical Engineering |
