The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform

Ioan Pop - One of the best experts on this subject based on the ideXlab platform.

  • Unsteady Flow across a stretching surface
    International Communications in Heat and Mass Transfer, 2010
    Co-Authors: Fadzilah Md Ali, Roslinda Mohd. Nazar, Norihan Md. Arifin, Anuar Mohd Ishak, Ioan Pop
    Abstract:

    In this paper, the problem of Unsteady uniform Flow across a stretching surface in an arbitrary direction is studied theoretically, where the unsteadiness is caused by the impulsive motion of the stretching surface. Numerical results of the governing partial differential equations are obtained using an implicit finite-difference scheme for the whole transient from the early or initial Unsteady-state Flow to the final steady-state Flow. The early Unsteady-state Flow is solved analytically. The numerical solution obtained for the reduced skin friction coefficient is compared with previously reported results and the results for velocity profiles, h and g profiles are also presented in this paper. It is found that there is a smooth transition from the small-time solution (initial Unsteady Flow) to the large-time solution (final steady-state Flow).

Fadzilah Md Ali - One of the best experts on this subject based on the ideXlab platform.

  • Unsteady Flow across a stretching surface
    International Communications in Heat and Mass Transfer, 2010
    Co-Authors: Fadzilah Md Ali, Roslinda Mohd. Nazar, Norihan Md. Arifin, Anuar Mohd Ishak, Ioan Pop
    Abstract:

    In this paper, the problem of Unsteady uniform Flow across a stretching surface in an arbitrary direction is studied theoretically, where the unsteadiness is caused by the impulsive motion of the stretching surface. Numerical results of the governing partial differential equations are obtained using an implicit finite-difference scheme for the whole transient from the early or initial Unsteady-state Flow to the final steady-state Flow. The early Unsteady-state Flow is solved analytically. The numerical solution obtained for the reduced skin friction coefficient is compared with previously reported results and the results for velocity profiles, h and g profiles are also presented in this paper. It is found that there is a smooth transition from the small-time solution (initial Unsteady Flow) to the large-time solution (final steady-state Flow).

Yuxuan Yang - One of the best experts on this subject based on the ideXlab platform.

  • Interpretation of Four Unique Phenomena and the Mechanism in Unsteady Flow Separation Controls
    Energies, 2019
    Co-Authors: Guoping Huang, Jinchun Wang, Yuxuan Yang
    Abstract:

    Unsteady Flow separation controls are effective in suppressing Flow separations. However, the unique phenomena in Unsteady separation control, including frequency-dependent, threshold, location-dependent, and lock-on effects, are not fully understood. Furthermore, the mechanism of the effectiveness that lies in Unsteady Flow controls remains unclear. Thus, this study aims to interpret further the unique phenomena and mechanism in Unsteady Flow separation controls. First, numerical simulation and some experimental results of a separated curved diffuser using pulsed jet Flow control are discussed to show the four unique phenomena. Second, the bases of Unsteady Flow control, Flow instability, and free shear Flow theories are introduced to elucidate the unique phenomena and mechanism in Unsteady Flow separation controls. Subsequently, with the support of these theories, the unique phenomena of Unsteady Flow control are interpreted, and the mechanisms hidden in the phenomena are revealed.

Li Qian - One of the best experts on this subject based on the ideXlab platform.

  • Real-time visualization algorithm of 2D Unsteady Flow field
    Journal of Computer Applications, 2010
    Co-Authors: Li Qian
    Abstract:

    In order to improve the rendering quality and speed of Unsteady Flow visualization results, the authors presented an improved Unsteady Flow visualization algorithm based on advection and texture blending. The temporal coherence in the Flow animation was got by image advection and the spatial coherence constructed in each frame was got by particle advection, and the temporal-spatial coherence was unified by texture blending at last. In this way, the texture detail of Flow animation is clear and the change in each frame is smooth. Furthermore, this algorithm can achieve a real-time frame rate. The high temporal-spatial coherence can exactly reflect Unsteady Flow dynamic variety.

Helwig Hauser - One of the best experts on this subject based on the ideXlab platform.

  • image space based visualization of Unsteady Flow on surfaces
    IEEE Visualization, 2003
    Co-Authors: Robert S Laramee, Bruno Jobard, Helwig Hauser
    Abstract:

    We present a technique for direct visualization of Unsteady Flow on surfaces from computational fluid dynamics. The method generates dense representations of time-dependent vector fields with high spatio-temporal correlation using both Lagrangian-Eulerian advection and image based Flow visualization as its foundation. While the 3D vector fields are associated with arbitrary triangular surface meshes, the generation and advection of texture properties is confined to image space. Frame rates of up to 20 frames per second are realized by exploiting graphics card hardware. We apply this algorithm to Unsteady Flow on boundary surfaces of, large, complex meshes from computational fluid dynamics composed of more than 250,000 polygons, dynamic meshes with time-dependent geometry and topology, as well as medical data.