an analysis is carried out to investigate the effects of variable chemical reaction, thermophoresis, temperaturedependent viscosity and thermal radiation on an unsteady mhd free convective heat and mass transfer flow of a viscous, incompressible, electrically conducting fluid past an impulsively started infinite inclined porous plate by taking into account the viscous dissipation effects. the g...

We present an Asymptotic-Preserving ’all-speed’ scheme for the simulation of compressible flows valid at all Mach-numbers ranging from very small to order unity. The scheme is based on a semi-implicit discretization which treats the acoustic part implicitly and the convective and diffusive parts explicitly. This discretization, which is the key to the Asymptotic-Preserving property, provides a ...

Unsteady boundary layer flow of an incompressible micropolar fluid over a stretching sheet when the sheet is stretched in its own plane is studied in this paper. The stretching velocity is assumed to vary linearly with the distance along the sheet. Two equal and opposite forces are impulsively applied along the x-axis so that the sheet is stretched, keeping the origin fixed in a micropolar flui...

The single-step one-shot method has proven to be very efficient for PDEconstrained optimization where the partial differential equation (PDE) is solved by an iterative fixed point solver. In this approach, the simulation and optimization tasks are performed simultaneously in a single iteration. If the PDE is unsteady, finding an appropriate fixed point iteration is nontrivial. In this paper, we...

Many of the previous works for solving the incompressible Navier-Stokes equations have been thought for homogeneous fluids. For multi-fluids flows there are two main differences: the possibility to have evolving discontinuities on the pressure field or to have evolving discontinuities on the pressure gradients. The first case appears when there are surface tensions at the internal interfaces, o...

Incompressible interfacial ows here refer to those incompressible ows possessing multiple distinct, immiscible uids separated by interfaces of arbitrarily complex topology. A prototypical example is free surface ows, where uid properties across the interface vary by orders of magnitude. Interfaces present in these ows possess topologies that are not only irregular but also dynamic, undergoing g...

Among the many experiments Which deals with study of characteristics flow, a numerical flow air (Pr=0.71) crosses circular cylinder is conducted. Variations in and thermal such as average Nusselt number, local pressure coefficient drag are presented around cylinders for Reynold numbers ranging from 100 to 5000 by solving incompressible two-dimensional unsteady Navier-Stokes energy equations. Co...

This article presents an unsteady incompressible Upper Convected Maxwell (UCM) fluid flow with temperature dependent thermal conductivity between parallel porous plates which are maintained at different temperatures varying periodically with time. Assume that there is a periodic suction and injection at the upper and lower plates respectively. The governing partial differential equations are re...

A numerical investigation of incompressible and transient flow around circular pipe has been carried out at different five gap phases. Flow equations such as Navier-Stokes and continuity equations have been solved using finite volume method. Unsteady horizontal velocity and kinetic energy square root profiles are plotted using different turbulence models and their sensitivity is checked against...

unsteady hydromagnetic generalised couette flow of a viscous, incompressible and electrically conducting fluid between two horizontal parallel porous plates darcian channel in the presence of a uniform transverse magnetic field taking hall current and ion-slip into account in a rotating system is investigated. an exact solution of the governing equations is obtained by laplace transform techniq...