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Search Results (9)
  • Open Access



    Albio D. Gutierreza,*, Hayri Sezerb, Jose L. Ramirezc

    Frontiers in Heat and Mass Transfer, Vol.18, No.1, pp. 1-12, 2022, DOI:10.5098/hmt.18.4

    Abstract This paper presents a computational model along with a thermal comfort criterion aimed at assisting the design of operating rooms (ORs) from the perspective of meeting suitable flow patterns and thermal comfort conditions for the occupants. The computational model is based on the finite volume method (FVM) to describe the air inside ORs along with the human thermoregulation model implemented in virtual mannequins for thermal comfort. The air model considers turbulent fluid motion, species transport and the conservation of energy, including thermal radiation. The human thermoregulation model incorporates two interacting systems of thermoregulation. Namely, the passive system and the active… More >

  • Open Access


    Passive Control of Base Pressure in a Converging-Diverging Nozzle with Area Ratio 2.56 at Mach 1.8

    Nur Husnina Muhamad Zuraidi1, Sher Afghan Khan1,*, Abdul Aabid2,*, Muneer Baig2, Istiyaq Mudassir Shaiq3

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.3, pp. 807-829, 2023, DOI:10.32604/fdmp.2023.023246

    Abstract In this study, a duct is considered and special attention is paid to a passive method for the control of the base pressure relying on the use of a cavity with a variable aspect ratio. The Mach number considered is 1.8, and the area ratio of the duct is 2.56. In particular, two cavities are examined, their sizes being 3:3 and 6:3. The used L/D spans the interval 1–10 while the NPRs (nozzle pressure ratio) range from 2 to 9. The results show that the control becomes effective once the nozzles are correctly expanded or under-expanded. The pressure contours at… More >

  • Open Access


    CFD Simulation of a Bag Filter for a 200MW Power Plant

    Yukun Lv, Jiaxi Yang*, Jing Wang

    FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.6, pp. 1191-1202, 2020, DOI:10.32604/fdmp.2020.010302

    Abstract The combustion of pulverized coal inevitably produces dust and other harmful substances. For these reasons, the optimization of de-dusting procedure and equipments is an aspect of crucial importance towards the final goal of making this source of energy more sustainable. In the present work, the behaviour of a “bag filter” is simulated using Computational Fluid Dynamics (CFD). More specifically, three possible approaches are used, differing with respect to the level of fidelity and the partial utilization of empirical data. The outcome of these simulations is mutually compared and finally discussed critically in the light of available experimental results. More >

  • Open Access


    Numerical Analysis of Pressure Distribution in a Brush Seal Based on a 2‐D Staggered Tube Banks Model

    Yuchi Kang1,2, Meihong Liu1, Sharon Kao‐Walter2,3, Jinbin Liu1, Qihong Cen4

    Intelligent Automation & Soft Computing, Vol.25, No.2, pp. 405-411, 2019, DOI:10.31209/2019.100000102

    Abstract A two-dimensional model of staggered tube banks of the bristle pack with different pitch ratios was solved by computational fluid dynamics (CFD). The pressure distribution along the gap centerlines and bristle surfaces were studied for different upstream pressure from 0.2 to 0.6MPa and models. The results show that the pressure is exponentially rather than strictly linearly decreasing distributed inside the bristle pack. The pressure distribution is symmetry about the circle’s horizontal line. The most obvious pressure drop occurred from about 60º to 90º. There is no stationary state reached between the kinetic energy and the static pressure when the upstream… More >

  • Open Access


    Novel Micromixer with Complex 3D-Shape Inner Units: Design, Simulation and Additive Manufacturing

    Di Wang1, Guangzhao Ye1, Jingming Mai2, Xiaomin Chen1, Yongqiang Yang1,*, Yang Li1,*, Xiaojun Chen1, Jie Chen1

    CMES-Computer Modeling in Engineering & Sciences, Vol.123, No.3, pp. 1061-1077, 2020, DOI:10.32604/cmes.2020.09842

    Abstract In this paper, a novel micromixer with complex 3D-shape inner units was put forward and fabricated by metal Additive Manufacturing (AM). The design of the micromixer combined the constraints of selective laser melting technology and the factors to improve mixing efficiency. Villermaux-Dushman reaction system and Compute Fluid Design (CFD) simulation were conducted to investigate the performance and the mechanism of this novel micromixer to improve mixing efficiency. The research found that the best mixing efficiency of this novel micromixer could be gained when the inner units divided fluid into five pieces with a uniform volume. Compared with a conventional micromixer… More >

  • Open Access


    The Hemodynamic Study on the Effects of Entry Tear and Coverage in Aortic Dissection

    Zhenxia Mu1, Xiaofei Xue1, Minrui Fu1, Dawei Zhao1, Bin Gao1, Yu Chang1,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.3, pp. 929-945, 2019, DOI:10.32604/cmes.2019.07627

    Abstract In this work, the hemodynamic effects of the type-A aortic dissection in different entry and covering entry tear positions were mainly studied. It provides a new method or idea in the field of the aortic dissection hemodynamics, and it is of profound significance to provide basic theoretical research on the development of aortic dissection in the aspect of clinical judgment. Two type-A aortic dissection models with different entry tear positions (Model 1: The entry tear was located at the entrance of the ascending aorta, Model 2: The entry tear was located at the starting position of the descending aorta) were… More >

  • Open Access


    Hemodynamic Based Surgical Decision on Sequential Graft and Y-Type Graft in Coronary Artery Bypass Grafting

    Xi Zhao, Youjun Liu∗,†, Wenxin Wang

    Molecular & Cellular Biomechanics, Vol.12, No.1, pp. 49-66, 2015, DOI:10.3970/mcb.2015.012.049

    Abstract Purpose: Sequential graft and Y-type graft are two different surgical procedures in coronary artery bypass grafting (CABG). The hemodynamic environment of them are different, that may cause different short-term surgical result and long-term patency. In this study, the short-term and long-term result of sequential and Y-type graft was discussed by comparing the hemodynamics of them. Materials and Methods: Two postoperative 3-dimensional (3D) models were built by applying different graft on a patient-specific 3D model with serious stenosis. Then zero-dimensional (0D)/3D coupled simulation was carried out by coupling the postoperative 3D models with a 0D lumped parameter model of the cardiovascular… More >

  • Open Access


    Computational Fluid Dynamics Analysis of Shroud Design on Hemodynamic Performance and Blood Damage in a Centrifugal Blood Pump

    Guangliang Pan1, Yu Chang1,*, Mingrui Fu1

    CMES-Computer Modeling in Engineering & Sciences, Vol.116, No.2, pp. 199-213, 2018, DOI: 10.31614/cmes.2018.04080

    Abstract Patients with extracorporeal membrane oxygenation still suffer from high rates of complication that linked to the flow field within the blood pump. So it is essential to optimise the geometry of the pump. The specification of shroud design is arguably the necessary design parameter in the centrifugal pump. However, the hemodynamic performances of the different shroud designs have not been studied extensively. In this study, ten different shroud designs were made and divided into two groups as the different covering locations (A: Covering the blade leading edge, B: Covering the blade trailing edge). In every group, six shroud designs with… More >

  • Open Access


    Computation of Aerodynamic Noise Radiated From Open Propeller Using Boundary Element Method

    Jun Huang1,2, Chaopu Zhang1, Song Xiang2, Liu Yang1, Mingxu Yi1

    CMES-Computer Modeling in Engineering & Sciences, Vol.108, No.5, pp. 315-330, 2015, DOI:10.3970/cmes.2015.108.315

    Abstract In order to accurately predict the aerodynamic noise of the propeller, a hybrid method combining Computational Fluid Dynamics (CFD) method with Boundary Element Method (BEM) is developed in this paper. The calculation includes two steps: firstly, the unsteady viscous flow around the propeller is calculated using the CFD method to acquire the noise source information; secondly, the radiated sound pressure is calculated using BEM method in the frequency domain. In comparison with the experimental results from wind tunnel, the calculated results of aerodynamic performance are rather desirable. The simulation and experimental results of aerodynamic noise are well fitted. The directivity… More >

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