An accurate description of the fluid flow and heat transfer within a Pressurized Water Reactor (PWR), for the safety analysis and reactor performance is always desirable. In this paper a mathematical model of the fundamental physical phenomena which are associated to a typical PWR is presented. The mathematical model governs the fluid dynamics in the reactor. Using commercial software CFX, a co...

Helicity plays an important role in spectacular geophysical phenomena such as hurricanes or the generation of terrestrial magnetic field. The present investigation shows how helicity can be created a statistically homogeneous but anisotropic flow, driven by buoyancy. If flow is close enough to two-dimensional limit, spontaneous symmetry breaking leads mean helicity. In particular, we explain th...

The hurricane remains one of the outstanding enigmas of fluid dynamics. This is so, in part, because the phenomenon is comparatively difficult to observe and because no laboratory analogue has been discovered. To this it must be added that hurricanes have received surprisingly little attention from the theoretically inclined fluid dynamicist, perhaps owing to an understandable tendency to avoid...

In this paper, we examine spatio-temporal evolution of free moving drops in a vertically stratified fluid and study the role of stratification on the rise velocity of a single drop, two drops and a swarm of rising drops. Utilizing fully resolved three-dimensional Direct Numerical Simulations (DNS), we discuss the effects of density stratification on the interaction of two drops and microstructu...

this paper presents a numerical simulation of developing flow and heat transfer of a viscoelastic fluid in a rectangular duct. in fully developed flow of a viscoelastic fluid in a non-circular duct, secondary flows normal to the flow direction are expected to enhance the rate of heat and mass transfer. on the other hand, properties such as viscosity, thermal conductivity, specific heat and rela...