Browsing Library by Author "Liu, Chaoqun"

Now showing items 1-20 of 23

    • CONSTRUCTION OF WEIGHTED UPWIND COMPACT SCHEME 

      Wang, Zhengjie (University of Texas at Arlington Libraries, 2015-05)
      Enormous endeavor has been devoted in spatial high order high resolution schemes in more than twenty five years previously, like total variation diminishing (TVD), essentially non-oscillatory scheme, weighted essentially ...

    • Direct Numerical Simulation For Flow Transition Over A Flat Plate 

      Deng, Shutian (Mathematics, 2007-08-23)
      In this paper, direct numerical simulation (DNS) of flow transition over a flat plate at a free stream Mach number of 0.5 and a Reynolds number of 1000 based on the free stream velocity and inflow displacement thickness ...

    • DNS Study For The Origin Of The Chaos In Late Boundary Layer Transition Over A Flat Plate 

      Thapa, Manoj Kumar (Mathematics, 2014-03-12)
      This dissertation is devoted to the investigation of the origin and mechanism of chaos ( asymmetric or disorganized flow) in late boundary layer transition over a flat plate without pressure gradient. This kind of flow not ...

    • GAIN SCHEDULING CONTROLLER FOR AIRCRAFT WITH MASS AND INERTIA VARIATION 

      Kim, Eunyoung; 0000-0002-1666-6283 (2018-06-28)
      Robustness is one of the main control design requirements for aircraft control.Robustness is sought in the stability and performance of closed loop system against various factors such as disturbance, measurement error, ...

    • High Order Compact Scheme For Discontinuous Differential Equations 

      Thompson, James Louis (Mathematics, 2011-07-14)
      A high order implicit second derivative compact method is given which is similar the Adams-Moulton method, but requiring only two steps for sixth order. This method is used in both predictor-corrector and Newton's method ...

    • High Order DNS For Late Flow Transition 

      Lu, Ping (Mathematics, 2012-07-25)
      In this report, a new high order scheme for boundary points is introduced when calculating the derivative of smooth functions by Compact Scheme. The primitive function reconstruction method of ENO schemes is applied to ...

    • HIGH ORDER DNS FOR VORTEX STRUCTURE IN LATE FLOW TRANSITION 

      Yang, Yong (2017-08-02)
      Turbulence is still a world puzzle after over one hundred years research, and the current and classical theories brim with self-contradictions. C. Liu proposed a new theory on turbulence generation and structure after 28 ...

    • High Order LES For Supersonic Ramp Flow Control With MVG 

      Yan, Yonghua (Mathematics, 2012-07-25)
      An implicitly implemented large eddy simulation by using the fifth order bandwidth-optimized WENO scheme is applied to make comprehensive studies on ramp flows with and without control at Mach 2.5 and Re=5760. Flow control ...

    • High Order Numerical Schemes For PDEs And Applications To CFD 

      Fu, Huankun (Mathematics, 2014-03-12)
      In the past two decades, many efforts have been made in developing high-order schemes with high resolution, such as compact scheme, essentially non-oscillatory scheme (ENO), weighted essentially non-oscillatory scheme ...

    • High Order Weighted Compact Boundary Condition 

      Wang, Zhengjie (Mathematics, 2008-09-17)
      In multi-dimension flows, we expect to have problems at the boundaries when a shock hits or reflects at the boundary wall the remedy to this would be to develop weighted boundary conditions similar to the Weighted Compact ...

    • High-order Numerical Schemes For High-speed Flows 

      Oliveira, Maria Luisa Bambozzi (Mathematics, 2009-09-16)
      A numerical scheme with high order of accuracy is necessary to resolve small length scales in flow transition and turbulence processes. However, numerical simulation for shock-boundary layer interaction, shock-acoustic ...

    • Large Eddy Simulation by using Wang’s Liutex-based subgrid model 

      Shah, Vishwa (2023-08-09)
      Turbulent flows and vortex structures in fluid dynamics have been captivating researchers for decades, owing to their intrinsic complexity and significance in various industrial and natural processes. Despite their fundamental ...

    • LES For Wing Tip Vortex Around An Airfoil 

      Cai, Jiangang (Mathematics, 2007-08-23)
      The wing tip vortex is very important because of its effects on the noise generation, blade/vortex interactions on helicopter blades, propeller cavitations on ships, and other fields. The objective of this work is to use ...

    • LIUTEX ANALYSIS BY POD AND DMD FOR VORTEX FORMATIONS IN BOUNDARY LAYER TRANSITION 

      Charkrit, Sita (2019-12-05)
      Vortices are considered as the building blocks of turbulent flows. To study how one type of vortex becomes another type especially in flow transition is one way to get better understanding about turbulence. In this ...

    • LIUTEX ANALYSIS BY POD AND DMD IN TURBULENT FLOW AFTER/ IN MICRO VORTEX GENERATOR 

      Trieu, Xuan My; 0000-0002-1560-1840 (2021-12-06)
      Although vortex has been studied more than one hundred year, we still have not had universally accepted definition. A few well-known vortex identification methods are introduced 𝑄,∆, 𝜆2,𝜆𝑐𝑖 criteria to identify coherent ...

    • LIUTEX-BASED VORTEX IDENTIFICATION METHODS AND THEIR APPLICATION IN DNS STUDY OF FLAT PLATE BOUNDARY LAYER TRANSITION 

      Shrestha, Pushpa; 0000-0002-3740-5170 (2021-07-26)
      Vortices are intuitively known as the rotational motion of fluid particles, however, unambiguous and universally accepted methods of vortex definition and identification are not available to date in the literature. ...

    • MATHEMATICAL APPROACH OF LIUTEX CORE LINE AND LIUTEX CORE TUBE FOR VORTEX STRUCTURE VISUALIZATION 

      Almutairi, Dalal Khalid B (2021-06-10)
      During the past decades, many vortex identification methods have been published to present a clear definition and identification of the vortex. However, all these methods are failed to offer a unique identification method, ...

    • MATHEMATICAL METHODS FOR VORTEX IDENTIFICATION WITH APPLICATION ON SHOCK WAVE VORTEX RING INTERACTION 

      Dong, Yinlin (2017-06-08)
      Vortices are seen everywhere in nature, from smoke rings to tornadoes. Vortical structures play an essential role in the turbulence dynamics such as turbulence generation, kinetic energy production and dissipation, enhancement ...

    • Mechanism of Hairpin Vortex Formation by Liutex 

      Yu, Yifei; 0000-0002-1213-0801 (2023-05-11)
      Turbulence is still a mystery for human after more than one century’s development of fluid dynamics. Hairpin vortex formation is regarded as an essential process for a laminar flow transition to the turbulent flow. A new ...

    • Numerical LES For MVG Controlled Supersonic Ramp Flow 

      Wang, Xiao (Mathematics, 2014-12)
      An implicitly implemented large eddy simulation by using the fifth order bandwidth-optimized WENO scheme is applied to make comprehensive studies on ramp flows with micro-ramp vortex generators (MVG) at Mach 2.5 and Re=5760. ...