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ACCELERATION STATISTICS IN INHOMOGENEOUS TURBULENT PIPE FLOW USING DIRECT NUMERICAL SIMULATION

Maurice Veenman
Department of Mechanical Engineering, Technische Universiteit Eindhoven Den Dolech 2, Eindhoven, 5600 MS, The Netherlands

Hans Kuerten
Department of Mechanical Engineering, Technische Universiteit Eindhoven Den Dolech 2, Eindhoven, 5600 MS, The Netherlands

Bert Brouwers
Department of Mechanical Engineering, Technische Universiteit Eindhoven Den Dolech 2, Eindhoven, 5600 MS, The Netherlands

Abstrakt

One-point acceleration properties are studied for inhomogeneous pipe flow using a direct numerical simulation. The acceleration is decomposed using the Navier-Stokes equations. In general, similar behavior is observed for variances of the acceleration components, probability density functions of the pressure and its gradient, and geometrical alignment as in incompressible, isotropic turbulence (Tsinober et al. Phys. Fluids, Vol. 13 (7), 2001). A question which requires further investigation is whether discrepancies from isotropic results are caused by the inhomogeneity of the flow or by the small value of the Re-number.