The effect of fluid Prandtl number on the thermal characteristics flow at thermal-entry region a hydrodynamically fully developed turbulent channel friction Reynolds Re?=180 is investigated using direct numerical simulation. Four test cases with molecular numbers Pr = 0.71, 1, 3, 7 are considered. results confirm that in contrast to laminar flows, where entry length increases increase number, f...

I report on recent progress in our understanding of the structure of CDM halos, and in particular of the inner mass profile of galaxysized systems. Numerical simulations have consistently shown that the density profiles of CDM halos steepen monotonically from the center outwards, with slopes shallower than isothermal near the center and steeper than isothermal near the virial radius. Ongoing de...

Numerous numerical studies indicate that dark matter halos show an almost universal radial density profile. The origin of the profile is still under debate. We investigate this topic and pay particular attention to the velocity dispersion profile. To this end we have performed high-resolution simulations with two independent codes, ART and Gadget. The radial velocity dispersion can be approxima...