Analysis of the aerodynamic, thermal and aeroelasticity (including vibration) processes in gas turbine stage is principal for a design creating turbines jet engine integrally. In this article was review showed basic problems, which are solved by engineers take numerical analysis flow. The special aspects appearance vanes blades channels turbojets turbine. fundamental structure boundary layer vo...

In order to reduce the additional resistance of high-speed amphibious vehicles, Flanks are designed on concave grooves. As a new drag reduction attachment, principle is analyzed and discussed in detail. this paper, HSAV model coupling tests performed based Reynolds-averaged Navier–Stokes method SST k−ω model. The accuracy numerical approach verified by series towing tests. Results show that wit...

This study investigated the performance of symmetric airfoils type NACA0012 numerically under different operating conditions. It has been assumed that involves steady state, non-compressive, and turbulent flows. The fluid was air. effect Reynolds number angle attack on lift drag coefficients, pressure distribution, velocity distribution investigated. ANSYS FLUENT used to solve numerical model b...

Abstract Vertical axis wind turbine (VAWT) array design requires adequate modelling of the wakes to model flow throughout and, therefore, power output turbines in array. This paper investigates how accurately different turbulence models using 2D computational fluid dynamics (CFD) simulations can estimate near and far VAWTs determine an approach towards accurate for design. Three experiments fro...

The reduction of energy consumption cars is always a significant issue in automotive design. Turbulent flow around car body very difficult to simulate accurately due the complexity conditions body, such as complex separation and laminar turbulent transition. In particular, over Ahmed with rear angle 25o considered challenging problem for RANS approach two-equation turbulence models. this study,...

Proof of Theorem 1. The proof is summarized in the following three steps. First, we prove Qn(ω, μ∗,Ω∗) ≥ Qn(ω, μ∗,Ω∗) for ‖ω(1) − ω∗ (1)‖2 = Op(n). In Step 2, we show that Qn(ω, μ ∗,Ω∗) ≥ Qn(ω, μ∗,Ω) for ‖Ω− Ω‖F = Op{(pn + an) log pn/n}. In Step 3, we prove that Qn(ω, μ∗,Ω) ≥ Qn(ω, μ,Ω) for ‖μ − μ‖2 = Op(pn log pn/n). The following are the details. 20 Step 1. Let ∆ω(1) = ω(1) − ω∗ (1), and h(ω(...

For a nonempty closed set Ω ⊂ AN with 2 ≤ #A < ∞, we consider 3 complexity functions of k = 0, 1, 2, · · · : (1) (block complexity) p Ω (k) := #Ω|{0,1,··· ,k−1}, (2) (maximal pattern complexity) pΩ(k) := supS⊂N, #S=k #Ω|S , (3) (minimal pattern complexity) p∗Ω(k) := infS⊂N, #S=k #Ω|S , where # denotes the number of elements in a set, and Ω|S is the restriction of Ω to S ⊂ N. If pΩ(k) = p∗Ω(k) (...

A heated room is numerically analyzed to study thermal comfort. Cold air flowing in from the inlet gets by a heat source (placed just below inlet), before being distributed throughout room. The presence of and high Rayleigh number causes flow be buoyant turbulent. Two RANS based turbulence models, RNG k-ε k-ω SST models are used model Discrete Ordinate (DO) radiation transfer between different ...

The outlet angle and shape of impeller blades are important parameters in centrifugal pump design. There is a lack detailed studies related to double curvature impellers pumps the current literature; therefore, an experimental numerical analysis was performed. Six were made then assessed test bed simulated via 3D CFD simulation. original also tested simulated. One manufactured had same design a...