Author: Alberto M. Hernandez
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
This design and applications project consists in the development of a parallel extension for a two-dimensional Detonation Shock Dynamics code, and to demonstrate how it can be applied for solving engineering problems in detonation physics. Detonation Shock Dynamics (DSD) is an asymptotic theory that describes the evolution of a multidimensional curve detonation shock in terms of an intrinsic evolution equation for the shock surface. Full-LS-DSD2D is a full level set Detonation Shock Dynamics code in Fortran 77 written by Dr. John Bdzil specifically for this project. A level set function numerical algorithm which embeds the two-dimensional detonation front in a three-dimensional filed function, phi(x,y,t), is used to solve for the location of the detonation front, which is given by phi(x,y,t) = 0. The code solves a modified Level Set PDE which maintains phi(x,y,t) as a distance function and uses a fully explicit. A parallel extension of the code was designed, IPC-DSD2D (Illinois Parallel Cluster DSD2D), as a Message Passing model using an MPI interface. IPC-DSD2D was benchmarked for scalability, accuracy and overall performance. Benchmarking was performed on a vertical rate stick problem that had ideal load balancing properties. The test problem was run on three different computer architectures: the Turing Cluster at the University of Illinois Urbana-Champaign, an eight core Macintosh Mac Pro, and NCSA0́9s SGI Altix (Cobalt).The benchmarking of the code showed very good performance metrics; the speedup and efficiency where high, and behaved in a stable and predictable pattern. After the code was verified and tested for performance and efficiency, it was used in a shape optimization study. A multicomponent nonlinear optimization system was built to generate optimal, shaped charge geometries using Detonation Shock Dynamics. The idea was to use IPC-DSD2D to estimate the shock pressure along a shaped charge liner and the normal shock velocity at the apex of the liner. These flow variables were then to be used as inputs for a Lagrangian finite element code to determine the shape of the jet that is formed by the detonation shock pressure crushing the liner. Through a set of constrained objective functions, a nonlinear optimizer, a shape can be found that has optimal jet properties. By running a DSD simulation of a simplified shaped charge, it was successfully shown how DSD could be used in the design of shaped charges. This thesis only describes the optimization system, and did not simulate the design loop. This thesis is divided into ten chapters. Chapters 1 and 2 briefly describe the theory of DSD and some necessary concepts in parallel computing design. Chapters 3 through 5 talk about the mathematical and numerical model used in DSD2D, and the parallel implementation of the code. Chapter 6 shows numerical results using IPC-DSD2D and Chapter 7 shows the parallel benchmarking of the code using the three computer architectures mentioned earlier. Chapter 8 describes the optimization system using DSD to find optimal shape charge geometries. Chapter 9 shows how to extend IPC-DSD2D for a three-dimensional DSD code [5]. Chapter 10 has the conclusions and final thoughts about the parallel implementation of Full-LS-DSD2D and the optimization system for designing shape charges using DSD.
Parallel Algorithms Applied to Problems in Two Dimensional Detonation Shock Dynamics
Author: Alberto M. Hernandez
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
This design and applications project consists in the development of a parallel extension for a two-dimensional Detonation Shock Dynamics code, and to demonstrate how it can be applied for solving engineering problems in detonation physics. Detonation Shock Dynamics (DSD) is an asymptotic theory that describes the evolution of a multidimensional curve detonation shock in terms of an intrinsic evolution equation for the shock surface. Full-LS-DSD2D is a full level set Detonation Shock Dynamics code in Fortran 77 written by Dr. John Bdzil specifically for this project. A level set function numerical algorithm which embeds the two-dimensional detonation front in a three-dimensional filed function, phi(x,y,t), is used to solve for the location of the detonation front, which is given by phi(x,y,t) = 0. The code solves a modified Level Set PDE which maintains phi(x,y,t) as a distance function and uses a fully explicit. A parallel extension of the code was designed, IPC-DSD2D (Illinois Parallel Cluster DSD2D), as a Message Passing model using an MPI interface. IPC-DSD2D was benchmarked for scalability, accuracy and overall performance. Benchmarking was performed on a vertical rate stick problem that had ideal load balancing properties. The test problem was run on three different computer architectures: the Turing Cluster at the University of Illinois Urbana-Champaign, an eight core Macintosh Mac Pro, and NCSA0́9s SGI Altix (Cobalt).The benchmarking of the code showed very good performance metrics; the speedup and efficiency where high, and behaved in a stable and predictable pattern. After the code was verified and tested for performance and efficiency, it was used in a shape optimization study. A multicomponent nonlinear optimization system was built to generate optimal, shaped charge geometries using Detonation Shock Dynamics. The idea was to use IPC-DSD2D to estimate the shock pressure along a shaped charge liner and the normal shock velocity at the apex of the liner. These flow variables were then to be used as inputs for a Lagrangian finite element code to determine the shape of the jet that is formed by the detonation shock pressure crushing the liner. Through a set of constrained objective functions, a nonlinear optimizer, a shape can be found that has optimal jet properties. By running a DSD simulation of a simplified shaped charge, it was successfully shown how DSD could be used in the design of shaped charges. This thesis only describes the optimization system, and did not simulate the design loop. This thesis is divided into ten chapters. Chapters 1 and 2 briefly describe the theory of DSD and some necessary concepts in parallel computing design. Chapters 3 through 5 talk about the mathematical and numerical model used in DSD2D, and the parallel implementation of the code. Chapter 6 shows numerical results using IPC-DSD2D and Chapter 7 shows the parallel benchmarking of the code using the three computer architectures mentioned earlier. Chapter 8 describes the optimization system using DSD to find optimal shape charge geometries. Chapter 9 shows how to extend IPC-DSD2D for a three-dimensional DSD code [5]. Chapter 10 has the conclusions and final thoughts about the parallel implementation of Full-LS-DSD2D and the optimization system for designing shape charges using DSD.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
This design and applications project consists in the development of a parallel extension for a two-dimensional Detonation Shock Dynamics code, and to demonstrate how it can be applied for solving engineering problems in detonation physics. Detonation Shock Dynamics (DSD) is an asymptotic theory that describes the evolution of a multidimensional curve detonation shock in terms of an intrinsic evolution equation for the shock surface. Full-LS-DSD2D is a full level set Detonation Shock Dynamics code in Fortran 77 written by Dr. John Bdzil specifically for this project. A level set function numerical algorithm which embeds the two-dimensional detonation front in a three-dimensional filed function, phi(x,y,t), is used to solve for the location of the detonation front, which is given by phi(x,y,t) = 0. The code solves a modified Level Set PDE which maintains phi(x,y,t) as a distance function and uses a fully explicit. A parallel extension of the code was designed, IPC-DSD2D (Illinois Parallel Cluster DSD2D), as a Message Passing model using an MPI interface. IPC-DSD2D was benchmarked for scalability, accuracy and overall performance. Benchmarking was performed on a vertical rate stick problem that had ideal load balancing properties. The test problem was run on three different computer architectures: the Turing Cluster at the University of Illinois Urbana-Champaign, an eight core Macintosh Mac Pro, and NCSA0́9s SGI Altix (Cobalt).The benchmarking of the code showed very good performance metrics; the speedup and efficiency where high, and behaved in a stable and predictable pattern. After the code was verified and tested for performance and efficiency, it was used in a shape optimization study. A multicomponent nonlinear optimization system was built to generate optimal, shaped charge geometries using Detonation Shock Dynamics. The idea was to use IPC-DSD2D to estimate the shock pressure along a shaped charge liner and the normal shock velocity at the apex of the liner. These flow variables were then to be used as inputs for a Lagrangian finite element code to determine the shape of the jet that is formed by the detonation shock pressure crushing the liner. Through a set of constrained objective functions, a nonlinear optimizer, a shape can be found that has optimal jet properties. By running a DSD simulation of a simplified shaped charge, it was successfully shown how DSD could be used in the design of shaped charges. This thesis only describes the optimization system, and did not simulate the design loop. This thesis is divided into ten chapters. Chapters 1 and 2 briefly describe the theory of DSD and some necessary concepts in parallel computing design. Chapters 3 through 5 talk about the mathematical and numerical model used in DSD2D, and the parallel implementation of the code. Chapter 6 shows numerical results using IPC-DSD2D and Chapter 7 shows the parallel benchmarking of the code using the three computer architectures mentioned earlier. Chapter 8 describes the optimization system using DSD to find optimal shape charge geometries. Chapter 9 shows how to extend IPC-DSD2D for a three-dimensional DSD code [5]. Chapter 10 has the conclusions and final thoughts about the parallel implementation of Full-LS-DSD2D and the optimization system for designing shape charges using DSD.
Los Alamos Science
Author:
Publisher:
ISBN:
Category : Laboratories
Languages : en
Pages : 604
Book Description
Publisher:
ISBN:
Category : Laboratories
Languages : en
Pages : 604
Book Description
Shock Waves - Proceedings Of The 20th International Symposium (In 2 Volumes)
Author: Hans G Hornung
Publisher: World Scientific
ISBN: 9814548022
Category :
Languages : en
Pages : 1740
Book Description
The symposia take place every two years. They are the forum at which scientists concerned with shock waves present their research. They USE shock waves for chemical kinetics studies, for materials studies, and smashing kidney stones; they STUDY the phenomena associated with flows involving shock waves, such as supersonic flow, explosions, detonations, volcanic eruptions, and, in this symposium, even such with-it topics as impact of Shoemaker-Levy on Jupiter and blast waves in the World Trade Center. They also discover new, bigger and better ways of generating flows at hypervelocity speeds and develop their technological tools further.The international exchange of information is documented in the proceedings volumes, which have become a storehouse of information on the subject, documenting the history of this peculiar branch of science that involves chemists, physicists, engineers, geophysicists, material scientists and biologists.
Publisher: World Scientific
ISBN: 9814548022
Category :
Languages : en
Pages : 1740
Book Description
The symposia take place every two years. They are the forum at which scientists concerned with shock waves present their research. They USE shock waves for chemical kinetics studies, for materials studies, and smashing kidney stones; they STUDY the phenomena associated with flows involving shock waves, such as supersonic flow, explosions, detonations, volcanic eruptions, and, in this symposium, even such with-it topics as impact of Shoemaker-Levy on Jupiter and blast waves in the World Trade Center. They also discover new, bigger and better ways of generating flows at hypervelocity speeds and develop their technological tools further.The international exchange of information is documented in the proceedings volumes, which have become a storehouse of information on the subject, documenting the history of this peculiar branch of science that involves chemists, physicists, engineers, geophysicists, material scientists and biologists.
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
Book Description
Joint Meeting of the U.S. Sections of the Combustion Institute, Western States, Central States, Eastern States
Author:
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 954
Book Description
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 954
Book Description
Developing Transputer Applications
Author: John Wexler
Publisher: IOS Press
ISBN: 9789051990201
Category : Computers
Languages : en
Pages : 230
Book Description
Publisher: IOS Press
ISBN: 9789051990201
Category : Computers
Languages : en
Pages : 230
Book Description
Celebrating 60 Years
Author: Los Alamos National Laboratory
Publisher:
ISBN:
Category : National security
Languages : en
Pages : 260
Book Description
Accompanying CD-ROM ... "contains a PDF version of 'Celebrating 60 years"--Page [8] of booklet.
Publisher:
ISBN:
Category : National security
Languages : en
Pages : 260
Book Description
Accompanying CD-ROM ... "contains a PDF version of 'Celebrating 60 years"--Page [8] of booklet.
Two-Dimensional Detonation Propagation Using Shock-Fitting
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
ICIAM 91
Author: Robert E. O'Malley
Publisher: SIAM
ISBN: 9780898713022
Category : Mathematics
Languages : en
Pages : 424
Book Description
Proceedings -- Computer Arithmetic, Algebra, OOP.
Publisher: SIAM
ISBN: 9780898713022
Category : Mathematics
Languages : en
Pages : 424
Book Description
Proceedings -- Computer Arithmetic, Algebra, OOP.
Mathematical Reviews
Author:
Publisher:
ISBN:
Category : Mathematics
Languages : en
Pages : 1106
Book Description
Publisher:
ISBN:
Category : Mathematics
Languages : en
Pages : 1106
Book Description