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International Journal for Multiscale Computational Engineering
IF: 1.016 5-Year IF: 1.194 SJR: 0.554 SNIP: 0.82 CiteScore™: 2

ISSN Print: 1543-1649
ISSN Online: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2020030934
pages 285-304

MULTIPHYSICS-MULTISCALE MODELING OF PLASMA-FACING STRUCTURES IN EXTREME HEAT AND RADIATION ENVIRONMENTS

Yue Huang
Department of Mechanical and Aerospace Engineering, University of California Los Angeles, Los Angeles, CA
Warren Nadvornick
Department of Mechanical and Aerospace Engineering, University of California Los Angeles, Los Angeles, CA
Arian Ghazari
Department of Mechanical and Aerospace Engineering, University of California Los Angeles, Los Angeles, CA
Nasr M. Ghoniem
Department of Mechanical and Aerospace Engineering, University of California Los Angeles, Los Angeles, CA

ABSTRACT

In many engineering applications, such as fusion energy, hypersonic aircraft, and other space vehicles, structures are exposed to unprecedented levels of photon (heat) and energetic particle (plasma) energy flux on their surfaces. The shallow depth of interaction results in rapid heating and potential destruction of such structures if not designed carefully. We present a new design strategy that is twofold: multiphysics and multiscale. First, the structural component is modeled with the relevant physics utilizing appropriate coupling techniques, and in this case, we couple fluid flow with heat transfer in both fluids and solids, together with structural mechanics. The component is optimized for performance with such integrated multiphysics coupled models. Then, the optimized component is modeled only for its structural reliability using a top-down approach that begins from an elastic solution, followed by more detailed and coupled elastoplastic continuum model for the critical zone. The effects of the material microstructure can be revealed by correcting the material properties based on modeling at the microscale. A design example is shown here for a modular plasma-facing component in a fusion energy device (plasma divertor). The cooled unit has a micro-engineered tungsten foam protective tile on top of solid tungsten closed tubing with heat removal internals. Details of the tungsten foam are modeled to obtain effective thermomechanical properties that are then used in the multiscale modeling hierarchy.

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