Group of Impact Dynamics and Coupling Effects

Our lab addresses a variety of topics in the general area of mechanics of materials and structures coupled with its working or processing environments, which include the interaction between the structure and fluid, the interaction between the structure and thermal field, and the interaction between the materials and shock loading. The overarching goal is the solution of technological problems through the integration of analytical, computational and experimental techniques. Depending on the specific problem at hand, we study and apply concepts and methods of solid mechanics, fluid mechanics, heat transfer and materials sciences.

 


Chenguang HUANG
Research Fellow
Deputy Director

Room 2-306
Key Laboratory for Mechanics in Fluid Solid Coupling Systems (LMFS)
Instituteof Mechanics(IM)
ChineseAcademyof Science (CAS)
No.15 Beisihuan West Road
BeijingPRC 100190
Tel: 86-10-8254-3879  
Fax: 86-10-8254-4256
E-mail: huangcg@imech.ac.cn
Web:People in LMFS, CAS

Hongwei SONG
Professor


 


Yiwei WANG
Associate Professor

Yanpeng WEI
Associate Professor


Lijuan LIAO
Associate Professor


Tezhuan DU
Assistant Professor


Xianqian WU
Assistant Professor


Xiaocui WU
Assistant Professor

 

 

  New Progresses

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内容

Study of Characteristics of Cloud Cavity Around Axisymmetric Projectile by Large Eddy Simulation
Title:  Study of Characteristics of Cloud Cavity Around Axisymmetric Projectile by Large Eddy Simulation
Author:  Yu XX(于娴娴);  Huang CG(黄晨光);  Du TZ(杜特专);  Liao LJ(廖丽娟);  Wu XC;  Zheng Z;  Wang YW(王一伟)
Reprint Author: Wang, YW (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China.
Abstract:  Cavitation generally occurs where the pressure is lower than the saturated vapor pressure. Based on large eddy simulation (LES) methodology, an approach is developed to simulate dynamic behaviors of cavitation, using k - mu transport equation for subgrid terms combined with volume of fluid (VOF) description of cavitation and the Kunz model for mass transfer. The computation model is applied in a 3D field with an axisymmetric projectile at cavitation number sigma = 0.58. Evolution of cavitation in simulation is consistent with the experiment. Clear understanding about cavitation can be obtained from the simulation in which many details and mechanisms are present. The phenomenon of boundary separation and re-entry jet are observed. Re-entry jet plays an important role in the bubble shedding.
URL:  http://dx.doi.org/10.1115/1.4026583
Journal Title:  JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
Hydrodynamics & Fluid-Structure Coupling area, which orients to analysis and solve the problems of mechanics of fluid-structure coupling system in the applications of the national key engineering projects, seeks to clarify the mechanisms, provide the design guideline and guarantee the safety in fluid-structure coupling systems in practical engineering. The main researches are mainly including:
    •     Unsteadycavitating flow mechanism
    •     Mechanism and dynamic loadings of collapse of cavitation bubbles around the high-speed underwater vehicle in the out-of-water process
    •     Fluid-structurecoupling of high-speed vehicle during underwater launching process
    •     Maneuverability of new pattern vehicles in the underwater and surface navigation conditions
    •     Fluid-structure coupling of the large-scale flexible airship.

 

This platform dedicates to the research of some transient energy transformation process (high-speed deformation of material, laser shock peening and explosive underwater etc.). The high density laser is used as the driven sources which can generated a very high amplitude (up to 5 GPa) pressure pulses in very short time (about 20 ns). A variety of high spatial and temporal resolution test method including PVDF (Polyvinylidene Fluoride), PDV (Photonic Doppler Velocimetry) and high-speed camera etc is adopted to capture the transient process. The main experimental system includes:
•  Laser shock peening system
•  Dynamic material property system
•  Underwater explosive system