基于并行计算的盾构机刀盘三维切削仿真
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摘要
针对盾构机工作时刀盘切削土体的数值仿真,建立了细致分析模型,并利用任意拉格朗日欧拉(ALE)和流固耦合(FSI)理论及方法来解决传统有限元方法进行切削仿真时易引发的网格大变形问题;在国产曙光4000A超级计算机上利用LS-DYNA MPP 970完成了并行计算,采用了传统递归坐标对分、以及根据仿真模型特点提出的基于耦合均衡坐标对分等两种区域分解策略。结果表明,ALE-FSI方法能有效处理刀盘切割土体仿真时的网格大变形,仿真数据与试验数据对比也比较一致;通过促进负载均衡,在计算时CBCB法比RCB法体现出了更好的加速比和并行效率。
A detailed analytical model was established for numerical simulation of soil cutting by the cutterhead in the shield machine. The Arbitrary-Lagrangian-Eulerian (ALE) method and the Fluid-Solid-Interaction (FSI) method were combined in solving the large mesh deformation problem easily caused by traditional finite element method during cutting simulation. Parallel computing was fulfilled in DAWNING 4000A supercomputer with LS-DYNA MPP 970 software, using the traditional recursive coordinate bisection method (RCB) and the improved coupling balance coordinate bisection method (CBCB) for domain decomposition, respectively. Results show that the ALE-FSI method effectively deals with large deformation of mesh during cutting simulation, and simulation data is also in good agreement with experimental data. Through promoting load balance, CBCB exhibits the better speedup and parallel efficiency than RCB.
A detailed analytical model was established for numerical simulation of soil cutting by the cutterhead in the shield machine. The Arbitrary-Lagrangian-Eulerian (ALE) method and the Fluid-Solid-Interaction (FSI) method were combined in solving the large mesh deformation problem easily caused by traditional finite element method during cutting simulation. Parallel computing was fulfilled in DAWNING 4000A supercomputer with LS-DYNA MPP 970 software, using the traditional recursive coordinate bisection method (RCB) and the improved coupling balance coordinate bisection method (CBCB) for domain decomposition, respectively. Results show that the ALE-FSI method effectively deals with large deformation of mesh during cutting simulation, and simulation data is also in good agreement with experimental data. Through promoting load balance, CBCB exhibits the better speedup and parallel efficiency than RCB.
引文
[1]沙智华,葛研军,赵亮,等.切削加工仿真建模技术研究[J].系统仿真学报,2005,17(4):789-792.(SHA Z H,GE Y J,ZHAO L,et al.A Review on Modeling Technology to Machining Simulation[J].Journal of System Simulation,2005,17(4):789-792.)
[2]KARMAKAR S,KUSHWAHA R.Simulation of Soil Deformation Around A Tillage Tool Using Computational Fluid Dynamics[J].Transactions of the ASAE(S0001-2351),2005,48(3):923-932.
[3]SUSILA E,HRYCIW R D.Large Displacement FEM Modeling of The Cone Penetration Test(CPT)in Normally Consolidated Sand[J].International Journal for Numerical and Analytical Methods in Geomechanics(S0363-9061),2003,27(7):585-602.
[4]郭术义,陈举华.流固耦合应用研究进展[J].济南大学学报(自然科学版),2004,18(2):123-126.
[5]PANTALéO,BACARIA J-L,DALVERNY O,et al.2D and3D Numerical Models of Metal Cutting with Damage Effects[J].Computer Methods in Applied Mechanics and Engineering(S0045-7825),2004,193(39):4383-4399.
[6]HAUFE A,WEIMAR K,GHNER U.Advance Airbag Simulation Using Fluid-structure-interaction and the Eulerian Method in LS-DYNA[C]//LS-DYNA Anwenderforum,Bamberg,German,DYNAmore GmbH,2004:1-9.
[7]郭毅之,金先龙.丁峻宏,等.并行数值仿真技术在盾构隧道地震响应分析中的应用[J].应用基础与工程科学学报,2005,13(1):43-50.
[8]曹银峰,郑军,李光耀,等.薄板冲压成形过程的并行有限元仿真技术[J].机械工程学报,2003,39(7):79-83.
[9]LEWIS B.Manual for LS-DYNA Soil Material Model147(FHWA-HRT-04-095)[R].Department of Transportation:Federal Highway Administration,U.S.A.,2004.
[2]KARMAKAR S,KUSHWAHA R.Simulation of Soil Deformation Around A Tillage Tool Using Computational Fluid Dynamics[J].Transactions of the ASAE(S0001-2351),2005,48(3):923-932.
[3]SUSILA E,HRYCIW R D.Large Displacement FEM Modeling of The Cone Penetration Test(CPT)in Normally Consolidated Sand[J].International Journal for Numerical and Analytical Methods in Geomechanics(S0363-9061),2003,27(7):585-602.
[4]郭术义,陈举华.流固耦合应用研究进展[J].济南大学学报(自然科学版),2004,18(2):123-126.
[5]PANTALéO,BACARIA J-L,DALVERNY O,et al.2D and3D Numerical Models of Metal Cutting with Damage Effects[J].Computer Methods in Applied Mechanics and Engineering(S0045-7825),2004,193(39):4383-4399.
[6]HAUFE A,WEIMAR K,GHNER U.Advance Airbag Simulation Using Fluid-structure-interaction and the Eulerian Method in LS-DYNA[C]//LS-DYNA Anwenderforum,Bamberg,German,DYNAmore GmbH,2004:1-9.
[7]郭毅之,金先龙.丁峻宏,等.并行数值仿真技术在盾构隧道地震响应分析中的应用[J].应用基础与工程科学学报,2005,13(1):43-50.
[8]曹银峰,郑军,李光耀,等.薄板冲压成形过程的并行有限元仿真技术[J].机械工程学报,2003,39(7):79-83.
[9]LEWIS B.Manual for LS-DYNA Soil Material Model147(FHWA-HRT-04-095)[R].Department of Transportation:Federal Highway Administration,U.S.A.,2004.
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