Synopsis Mathematical modeling of stress generation in casting processes is a difficult, complex subject that is now receiving increased attention. This paper reviews the basic equations, solution methods and important phenomena associated with casting processes that require special numerical treatment. Stress modeling begins with a coupled, transient heat transfer analysis, including solidific...

The bottom-hole pressure of hydraulic fracturing in ductile reservoirs is much higher than that the simulation, and fracture toughness inferred from field data 1–3 orders magnitude measured laboratory. rock apparent increases with increase confining pressure. Excluding influence fluid viscosity lag on toughness, process zone (FPZ) at tip can explain difference between laboratory field. passivat...

With the development of plastic surgery techniques, computer aided approach has become a significant method in medical plastic surgery. In order to solve effects on surgical results made by the surface of a wound in craniofacial cosmetic surgery, accurate preoperative preparation is usually required for the surgery. This paper summarizes the application of computer aided technology in craniofac...

In this study, synthetic sulfonated polymers were used in order to enhance the rheological properties of drilling fluids. The capability of these polymers in reducing the effects of environmentally friendly, but harmful, pollutants such as cement, calcium chloride, gypsum as well as pH changes were investigated. In the present work, two sulfonated synthetic polymers, namely Polythin and Polydri...

We present a numerical code for calculating transient flow in plastic pipes, especially in the polyethylene pipe, to analysis water hammer phenomena. The set partial differential equations to be solved is obtained using conservation laws and behavior for the fluid and the pipe wall, associated with constitutive equations of the two media, and relationships compatibility of interfaces on velocit...

Magnetorheological (MR) fluids with Fe3O4 particles are widely studied nowadays due to their soft magnetic nature, controllable morphology, and better chemical stability as compared metallic counterpart. However, they can be even more advantageous under Zn doping elevated magnetization hollow configuration low density, making them active, stable, dispersible in the carrier fluid. Here, we repor...

In order to establish the tangential contact stiffness and damping model of solid–liquid interface by exciting vibration force under mixed lubrication, finite difference method was firstly used solve average flow equation considering effect roughness on lubrication effect, bearing capacity, shear force, friction coefficient oil film were obtained, thereby dynamic harmonic excitation calculated....

In this paper, a numerical study is conducted in order to compare hyperbolic range of equations of isotherm two-fluid model governing on two-phase flow inside of pipe using conservative Shock capturing method. Differential equations of the two-fluid model are presented in two forms (i.e. form I and form II). In forms I and II, pressure correction terms are hydrodynamic and hydrostatic, respecti...

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