Abstract The purpose of this article is to summarize our recent progress in high-order and high accurate CFD methods for flow problems with complex grids as well discuss the engineering prospects using these methods. Despite rapid development algorithms CFD, applications on configurations are still limited. One main reasons which hinder widely complexity grids. Many aspects can be neglected low-order schemes must treated carefully ones when complex. In order implement finite difference...

There are still some challenges, such as grid quality, numerical stability, and boundary schemes, in the practical application of high-order finite difference schemes for complex configurations. This study presents improved strategies that indicate potential engineering applications schemes. The formally fifth-order weighted compact nonlinear scheme developed by authors is implemented on point-matched multiblock structured grids, which generated over configurations to ensure quality each...

Heat transfer correlation describes the relationship between heat and factors such as fluid properties flow conditions. The establishment of correlations is paramount importance in design calculation exchangers reactors various chemical engineering fields well certain aerospace applications. In this study, we present a theoretical derivation model for fully developed with gas-phase homogeneous reactions. By means derivations, modeling complex multi-physics coupling problems can be...

Computational fluid dynamics predictions based on machine learning methods have become an important area of turbulence and transition research. However, the otherwise efficient low-cost models Reynolds-averaged Navier–Stokes (RANS) limited capability for dealing with hypersonic conditions, owing to strong compressibility multimodal features that are then present. This paper develops augmented method heat flux prediction. A deep neural network (DNN) is trained using flight test data from...

Abstract We have studied the transformation process from primary instabilities to secondary with direct numerical simulations and stability theories (Spatial Biglobal plane-marching parabolized equations) in detail. First Mack mode second are shown be able evolve into sinuous varicose of instability, respectively. Although characteristics eventually lose downstream due synchronization continuous spectrum, is found trigger a sequence resonations which turn give birth highly unstable...

Understanding crossflow instabilities in three-dimensional boundary layers triggered by either traveling waves or stationary vortices is of great importance for modeling, predicting, and controlling hypersonic laminar-turbulent transition. However, due to very limited available flight experiment data, the instability under real conditions still far from fully understood. To gain further insight, raw data a recent model conducted China Aerodynamics Research Development Center have been...

Boundary-layer transition (BLT) is one of the key problems in developing hypersonic aircrafts. Major aerospace countries all over world have been heavily supporting relevant researches, and project funding keeps increasing recent years. In this paper, wind tunnel experiments, numerical simulations theoretical analysis are combined to study some hot issues area, which include effects unit Reynolds number, angle attack nose bluntness, nonlinear interactions during breakdown, secondary...

In this paper, a new multistage self-organizing channel assignment algorithm with transiently chaotic neural network (MSSO-TCNN) is proposed as an optimization algorithm. The used for assigning channels in cellular mobile networks to cells the frequency domain. MSSO-TCNN consists of progressively initial stage and TCNN stage. According difficulty measure each cell, first executed assign cell by inspired mechanism bristle. If optimum solution not obtained stage, then applied continue until...

Efficient utilization of chemical heat sinks and enhancement transfer are key issues for the thermal protection advanced hypersonic flight vehicles. However, influences residence time on pyrolysis convection hydrocarbon fuel different, which is important design optimization cooling systems. Therefore, a multidimensional numerical simulation model based molecular reaction aviation kerosene, RP-3, established. This reveals that has great influence sink characteristics under supercritical...

Recently, design of sparse finite impulse response (FIR) digital filters has attracted much attention due to its ability reduce the implementation cost. However, finding a filter with fewest number nonzero coefficients subject prescribed frequency domain constraints is rather difficult problem because non-convexity. In this paper, an algorithm based on binary particle swarm optimization (BPSO) proposed, which successively thins until no sparser solution can be obtained. The proposed...

During the cracking process of hydrocarbon fuel, heat would be converted into internal energy and chemical energy. It is necessary to study conversion relationship between in above-mentioned process, which great significance for efficient use fuel sinks regenerative cooling process. Therefore, influences pressure, mass flow rate, wall flux, heating rate on were investigated, an empirical prediction model was developed. The numerical results revealed that influence pressure sink mainly...

Abstract The work develops a localized hypersonic cross-flow transition criterion considering the influence of intensity and surface roughness. A extension modified γ-Re θ model based on Chant2.0 computing platform is implemented. extended used to predict elliptic cone (HIFiRE-5) in multiple states, predicted results are good accordance with experimental results.

Kazhdan and Lusztig introduce the $W$-graphs to describe cells molecules corresponding Coxeter groups. Building on this foundation, defines a-funtion classify cells, as well molecules. Marberg then generalizes Lusztig's $W$-graphs, using fixed-point-free involutions their indices. The of two new $S_n$-graphs are classified via correspondence similar RSK by me. In paper, we define an analogue a-function finish classification proving that every molecule in is indeed a cell.

Abstract In the process of hypersonic boundary layer transition, leading edge receptivity due to free-stream acoustic disturbance provides unstable perturbations in with initial amplitudes, which is one hot issues study about transition mechanism. The influenced by many factors, involving geometry parameters, types, etc., among bluntness plays a key role for generating disturbances. order reveal mechanism influence on investigations into flat plates sharp and blunt are carried out. flow...

An electric control and data acquisition system of longitudinal axial flow cleaning device test-bed was designed based on the technology computer aided testing. The can collect real-time data, adjust parameters timely, operate simply, provide reliable for experimental study device. experiments show that accuracy experiment is improved by system, which has significant guide to study, design manufactory