2D Channel Flow with/without Scalar Transport
DNS by Horiuti
Near-wall turbulent flows arise under several dynamical effects. Recent direct numerical simulation
(DNS) results of homogeneously sheared turbulence suggest that a key factor of the generation of near-wall
coherent structures, e.g., streaky and vortical structures, is the high mean shear rate caused by the no-slip
condition on a wall surface (Rogers & Mon, 1987; Lee et at. 1990), Hence, It is obvious that it should be
desirable to study the possible dynamical effects individually, I.e.,
- viscosity (low Reynolds number effects),
- blocking of wall-normal melon.
- mean shear rate, In order to understand the basic mechanisms of near-wall turbulence phenomena. In the present work,
we pay attention especially to the effect of the mean shear rate. We carried out DNSs of turbulent plane Couette-Poiseuille flows in
which the mean shear rate on one wall could be varied by changing relative wall velocities and a streamwise pressure gradient. With
these DNS databases, turbulence statistics and structures under different wall shear rates were investigated.
Previous and Reference Numerical Solutions