Abstract This paper presents a critical evaluation of the physical aspects lift generation to prove that no can be generated in steady inviscid flow. Hence, answer recurring question title is negative. In other words, fluid viscosity necessary generation. The relevant topics include D’Alembert’s paradox and drag, Kutta condition, force expression based on boundary enstrophy flux (BEF), vortex l...

We consider a laminar, steady, two-dimensional flow of an incompressible Newtonian fluid in a channel at high Reynolds number. When the walls are slightly deformed, adverse pressure gradients are generated and separation can occur. The analysis of the flow structure has been done essentially by Smith [7]. Later, a systematic asymptotic analysis has been performed by Saintlos and Mauss [6]. More...

flow in the first two-stage of v 94.2 gas turbine is simulated numerically. in this turbine, the second stator is clocked relative to the first stator to different positions. steady-state analysis was carried out by varying the circumferential relative position of the consecutive stator vanes to study the effects of the clocking on turbine performance. a density based compressible inviscid flow...

Point vortex ows of a steady, two dimensional, inviscid, and incompressible uid are studied for doubly connected geometries. The Routh function is explicitly constructed, and equilibrium conngurations of vortices are found by determining critical points numerically. The numerical computations make use of an analogue of the Schwarz-Christooel transformation for doubly connected regions.

This article considers a family of steady multipolar planar vortices which are the superposition of an axisymmetric mean flow, and an azimuthal disturbance in the context of inviscid, incompressible flow. This configuration leads to strongly nonlinear critical layers when the angular velocities of the mean flow and the disturbance are comparable. The poles located on the same critical radius po...

Potential flows of incompressible fluids admit a pressure (Bernoulli) equation when the divergence of the stress is a gradient as in inviscid fluids, viscous fluids, linear viscoelastic fluids and second-order fluids. We show that the equation balancing drag and acceleration is the same for all these fluids independent of the viscosity or any viscoelastic parameter and that the drag is zero in ...

Theoretical analyses of the stability of symmetric and asymmetric vortex pairs over slender conical wing-body combinations consisting of a slender circular or elliptic cone and a flat-plate delta wing under small perturbations in an inviscid incompressible steady flow at high angles of attack with or without sideslip are presented. The three-dimensional flow problem is reduced to a problem in t...

A new finite difference scheme on a non-uniform staggered grid in cylindrical coordinates is proposed for incompressible flow. The scheme conserves both momentum and kinetic energy for inviscid flow with the exception of the time marching error, provided that the discrete continuity equation is satisfied. A novel pole treatment is also introduced, where a discrete radial momentum equation with ...

Steady free-surface flow due to a pressure distribution under both gravity and capillary effects in water of finite depth is considered. The fluid is assumed to be inviscid and incompressible and the flow is irrotational. The problem is formulated as an integro-differential equation. Numerical results are found to depend on three parameters: Froude number, F , Bond number, τ∗, and the magnitude...

In this paper, we simulate steady inviscid flows over a cylinder using potential and stream functions, including entropy and vorticity corrections for incompressible, subsonic, transonic and supersonic flows. The present hierarchical formulation is equivalent to Euler equations satisfying conservation of mass, momentum and energy. Standard numerical schemes and iterative algorithms are used for...