Department of Mechanical Engineering, Unit Catalogue 2011/12 |
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 Credits:
| 6 |
| Level:
| Masters UG & PG (FHEQ level 7) |
| Period: |
Semester 1 |
| Assessment:
| EX100 |
| Supplementary Assessment: | Supplementary assessment information not currently available (this will be added shortly) |
| Requisites:
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| Description:
| Aims: To give students an understanding of the quantitative analysis of turbulence in engineering flows. To give students the ability to analyze aerodynamically generated noise radiated from engineering systems. Learning Outcomes: After taking this unit the student should be able to: Perform basic analyses of turbulent flows, using appropriate mathematical and statistical methods; perform basic calculations of noise under suitable approximations; discuss turbulence, noise and their interaction in real engineering systems. Skills: Problem solving; numeracy; working independently. Content: The Navier-Stokes equations, non-dimensionalization, qualitative description of turbulence. Reynolds averaged Navier Stokes equations, Reynolds stresses, turbulent viscosity, Prandtl mixing length hypothesis. Free shear flows, turbulent length and time scales, kinetic energy and the Kolmogorov spectrum. Turbulent boundary layers. The wave equation in three dimensions: spherical and plane waves. Frequency and time domain representations, spectral and statistical analysis of signals: power- and cross-spectrum, correlation and coherence. Modification of sound fields: reflection by hard, soft and finite impedance walls. Source mechanisms and directivity: monopole, dipole and quadrupole. Sound generation by solid bodies: pulsating sphere, circular piston. Sound from rotating systems, application to propellers and rotors. Acoustic fields in circular ducts, plane and higher order modes. Radiation from circular ducts, application to aircraft engine noise. Turbulent jets Lighthill's acoustic analogy, eighth power law. Far-field noise cross-spectrum from turbulent jets. Boundary layer noise. Vortex dynamics and the Biot-Savart law; vortex ring interactions, leapfrogging. Coherent structures in turbulence and noise generation. |
| Programme availability: |
ME40328 is Optional on the following programmes:Department of Mechanical Engineering
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