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Sr. Principal Research Scienti

At Northrop Grumman, our employees have incredible opportunities to work on revolutionary systems that impact people's lives around the world today, and for generations to come. Our pioneering and inventive spirit has enabled us to be at the forefront of many technological advancements in our nation's history - from the first flight across the Atlantic Ocean, to stealth bombers, to landing on the moon. We look for people who have bold new ideas, courage and a pioneering spirit to join forces to invent the future, and have fun along the way. Our culture thrives on intellectual curiosity, cognitive diversity and bringing your whole self to work - and we have an insatiable drive to do what others think is impossible. Our employees are not only part of history, they're making history.

Northrop Grumman Innovation Systems designs, builds and delivers space, defense and aviation-related systems to customers around the world. Our main products include launch vehicles and related propulsion systems; missile products, subsystems and defense electronics; precision weapons, armament systems and ammunition; satellites and associated space components and services; and advanced aerospace structures.

We are currently seeking an experienced Theoretical Physicist to provide technical leadership to our R&D Motor Health Management team in our Promontory, UT offices.

Role description & Responsibilities:

As a Theoretical Physicist in the Propulsion Systems R&D Labs you will be responsible for creating models of energetic material mixtures and modeling system behaviors of the devices that employ them. You will have ownership of your work from the proposal phase to final conclusions. You will parameterize the models under study with chemical, mechanical, and meso-level data. Hence, knowledge of various experimental techniques is a plus. By applying boundary conditions of interest (e.g., temperature, humidity, displacement, loads) to the equations governing material behavior, and using associated error roll-up of all uncertainties, you will deliver predicted material and/or system behaviors with confidence intervals. You will also be responsible for designing and overseeing teams to perform tests supporting validation of the models.

Job Duties:

  • Derivingcomplex material and processing models from the material microstructure,utilizing best available theory, computational tools, and software.The model types and mathematicaltechniques may include but are not limited to
    • Chemicalkinetics and diffusion processes in multiple materials for arbitraryboundary and initial conditions.
    • Techniquesto derive asymptotic solutions to aid in solving stiff equations.
    • Polymerphysics and viscoelasticity
    • Heattransport models
    • Particulatemechanics models
    • Slurrymechanics models
  • Dataanalysis and statistics skills, including
    • MonteCarlo algorithms
    • Error roll-up statistical tools including regression
    • Uncertaintyquantification


Experience Requirements:

  • U.S.Citizen (DoD Secret security clearance will be required)
  • In-depthfamiliarity with classical mechanics, electromagnetic theory,thermodynamics, and quantum mechanics.
  • Excellentmathematical skills, both analytical and numerical, including
    • Solutionsof differential equations, both analytical and numerical
    • Approximationsof difficult nested integrals and sums, including a working knowledge ofmany of the special functions of mathematics

Experience Preferred:

  • Goodwriting and verbal/presentation skills with the ability to writeproposals, publish technical papers, compile final reports for large,multidisciplinary programs
  • Goodteam-worker, especially the ability to work well with a multi-disciplinaryteam

Skills & Qualifications:

  • Ability to program in high-level languages (e.g., C++, Python and Mathematica).
  • Must be able to design and direct complex and expensive test programs to support modeling efforts.
  • Familiaritywith condensed matter field theory and group theory is desirable.
  • Understandingof solid mechanics, chemical kinetics, diffusion (and general transport)phenomena, fluid mechanics, and particulate/multi-phase mechanics.
  • Familiaritywith the operation of computational chemistry codes such as Gaussian16,NWchem, or Schrodinger is a plus.
  • Familiaritywith the operation of multi-physics numerical simulation software such asCTH, ALE3D, or ANSYS Autodyn is a plus.


  • PhD degree in Physics plus 5 years' experience

Northrop Grumman is committed to hiring and retaining a diverse workforce. We are proud to be an Equal Opportunity/Affirmative Action Employer, making decisions without regard to race, color, religion, creed, sex, sexual orientation, gender identity, marital status, national origin, age, veteran status, disability, or any other protected class. For our complete EEO/AA and Pay Transparency statement, please visit U.S. Citizenship is required for most positions.

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