Lawrence Livermore National Laboratory

Computational Physicist

Location: Livermore, CA
Category: Science & Engineering
Organization: Physical and Life Sciences
Posting Requirement: External w/ US Citizenship
Job ID: 102621
Job Code: Science & Engineering MTS 3 (SES.3)
Date Posted: August 22 2017

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Science and Technology on a Mission!
For more than 60 years, the Lawrence Livermore National Laboratory (LLNL) has applied science and technology to make the world a safer place.

We have openings for Computational Physicists. You will create or adapt state-of-the-art computational physics and computational geosciences algorithms, ensure the fidelity and performance of their implementation, and support their usage by multiple teams on demanding classes of problems. These positions are in the Computational Geosciences Group of the Atmospheric, Earth and Energy Division which also provides support to Weapons and Complex Integration programs.
Essential Duties
- Create or identify state-of-the-art computational physics and computational geosciences algorithms that extend modeling capabilities, implement as software suitable for high-performance computers, and document their verification.
- Establish expertise in using one or more finite elements, finite differences and finite volume based simulation tools such as Geodyn, Geodyn-L, ALE3D or elastic wave propagation codes.
- Evaluate complex algorithms for current and future problem classes, developing a body of experience with which to guide users and establish strategies for future improvements.
- Interact with users to assess software performance and provide solutions for complex issues of modeling or software errors.
- Adapt software development and QA practices and contribute to their continuous improvement.
- Document efforts in technical reports, publish papers in peer-reviewed journals, and present results at scientific meetings and conferences.
- Apply existing and newly developed codes and analyze results of non-linear shockwave problems, compressible fluids and structural damages.
- Conduct presentations to internal and external collaborators.
- Perform other duties as assigned.

- PhD in engineering, physics or applied mathematics with a computational shock physics focus desired, or the equivalent combination of education and related experience.
- Advanced knowledge of computational physics, mechanics, geosciences and the theory and application of finite element methods, finite volumes or finite differences for non-linear shocks in compressible media.
- Proficiency in Fortran or C/C++ programming and fluent in Python and shell scriptings.
- Significant experience in at least one of the following topical areas: advanced spatial discretization for large deformation response, advanced representations of nonlinear response of geological materials, coupled multi-physics simulation, including fluid-structures and shock-structures interaction.
- Advanced knowledge of implicit and explicit schemes for solving wave propagation problems on HPC using OpenMP and/or MPI platforms.
- Demonstrated ability to conduct independent research.
- Advanced verbal and written communication skills necessary to effectively collaborate in a team environment and present and explain technical information.
- Ability to travel and conduct presentations to external collaborators and sponsors under short notice.
Desired Qualifications
- Experience with software implementations on parallel systems.
- Extensive knowledge of numerical methods for nonlinear solid and fluid interactions.

Pre-Employment Drug Test:  External applicant(s) selected for this position will be required to pass a post-offer, pre-employment drug test.

Security Clearance:  This position requires a Department of Energy (DOE) Q-level clearance.
If you are selected, we will initiate a Federal background investigation to determine if you meet eligibility requirements for access to classified information or matter. In addition, all L or Q cleared employees are subject to random drug testing.  If you hold multiple citizenships (U.S. and another country), you may be required to renounce your non-U.S. citizenship before a DOE L or Q clearance will be processed/granted.

Note:  This listing has multiple openings; these are Career Indefinite positions.  Lab employees and external candidates may be considered for these positions.

About Us

Lawrence Livermore National Laboratory (LLNL), located in the San Francisco Bay Area (East Bay), is a premier applied science laboratory that is part of the National Nuclear Security Administration (NNSA) within the Department of Energy (DOE). LLNL's mission is strengthening national security by developing and applying cutting-edge science, technology, and engineering that respond with vision, quality, integrity, and technical excellence to scientific issues of national importance. The Laboratory has a current annual budget of about $1.8 billion, employing approximately 6,500 employees.

LLNL is an affirmative action/ equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, marital status, national origin, ancestry, sex, sexual orientation, gender identity, disability, medical condition, protected veteran status, age, citizenship, or any other characteristic protected by law.

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