A Method for Turbulent Pressure Field Measurement
Technical Report,01 Oct 2017,30 Sep 2018
NSWCCD W. Bethesda United States
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A procedure for computing the turbulent pressure field from time-resolved particle image velocimetry PIV velocity field data is adapted and implemented. The calculation of pressure is based on the Lagrangian acceleration term in the fluctuating momentum equation coupled with an omnidirectional spatial integration, originally developed by Liu and Katz 2006 Exp. Fluids 41227-240. Experimental measurements of fluctuating pressure is important in the validation of numerical turbulence models and is also a fundamental source of observed aerohydro-acoustic noise. The code suite described in this paper yields the fluctuating pressure with Lagrangian fluid acceleration and spatial gradients of velocity. Monte Carlo simulations are performed with synthetic velocity fields to study the uncertainty in the calculations, and sources of uncertainty and data requirements are discussed.
- Fluid Mechanics
- Numerical Mathematics