In the present work, aerodynamic performance of full helicopter PSP in hover flight is investigated using a simplified concept multiple reference frame (MRF) technique context high-order Monotone Upstream Centred Scheme for Conservation Laws (MUSCL) cell-centred finite volume method. The predictions were obtained two ground distances and several collective pitch angle at tip Mach number 0.585. ...

We propose a flux vector splitting (FVS) for the solution of film flows radially spreading on a flat surface created by an impinging jet using the shallow-water approximation. The governing equations along with the boundary conditions are transformed from the physical to the computational domain and solved in a rectangular grid. A first-order upwind finite difference scheme is used at the point...

A third-order explicit time-stepping model for the simulations in open channels flow is presented. The time discretization of one-dimensional SaintVenant’s basic equations is obtained by Taylor series expansion, formulated in multi-stage approach, whereas the spatial discretization is obtained by finite difference central scheme. Firstand second-order models have been obtained by using piecewis...

In 1952, Zoll described a technique for artificial pacing of the heart. The method employed electrodes placed on the chest wall and electrical impulses of 2 msec. duration at 25-150 volts. Although this indirect technique proved successful in resuscitating and temporarily maintaining life in patients with Stokes-Adams attacks due to asystole, the high voltage required produced skin burns and pa...

We present a highly robust second order accurate scheme for the Euler equations and the ideal MHD equations. The scheme is of predictor-corrector type, with a MUSCL scheme following as a special case. The crucial ingredients are an entropy stable approximate Riemann solver and a new spatial reconstruction that ensures positivity of mass density and pressure. For multidimensional MHD, a new disc...

The finite volume methods are one of the most popular numerical procedure to approximate the weak solutions of hyperbolic systems of conservation laws. They are developed in the framework of first-order numerical schemes. Several approaches are proposed to increase the order of accuracy. The van Leer methods are interesting ways. One of them, namely the MUSCL-Hancock scheme, is full time and sp...

In the present work, aerodynamic performance of Caradonna and Tung S-76 in hover were investigated using a simplified concept multiple reference frame (MRF) technique context high-order Monotone Upstream Centred Scheme for Conservation Laws (MUSCL) cell-centred finite volume method. methodology, is defined at solver level by simple user input avoiding use mesh interface to handle intersections ...

An unsteady two-dimensional finite-volume solver was developed based on Van Leer’s flux splitting algorithm in conjunction with “Monotonic Upstream Scheme for Conservation Laws (MUSCL)” limiters to improve the order of accuracy and the two-layer Baldwin-Lomax turbulence model was also implemented. Two test cases were prepared to validate the solver. The computed results were compared with the e...

Abstract. We propose here a decomposition of the respiratory tree into three stages which correspond to different mechanical models. The resulting system is described by the Navier-Stokes equation coupled with an ODE (a simple spring model) representing the motion of the diaphragm muscl. We prove that this problem has at least one solution locally in time for any data and, in the special case w...