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Division Spotlight
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
Meeting Spotlight
2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Latest News
Proving DRACO will deliver
The United States is now closer than it has been in over five decades to launching the first nuclear thermal rocket into space, thanks to DRACO—the Demonstration Rocket for Agile Cislunar Orbit.
Han Young Yoon, Seiichi Koshizuka, Yoshiaki Oka
Nuclear Science and Engineering | Volume 133 | Number 2 | October 1999 | Pages 192-200
Technical Paper | doi.org/10.13182/NSE99-A2081
Articles are hosted by Taylor and Francis Online.
A numerical method is presented for mesh-free calculation of moving interface problems in two-phase flow. In this method, the moving particle semi-implicit (MPS) method is combined with the meshless advection using flow-directional local-grid (MAFL) method, for an arbitrary Lagrangian-Eulerian calculation. Moving interfaces are directly traced in Lagrangian coordinates, while fixed boundaries such as inlet and outlet flows are calculated in Eulerian coordinates. The phase interface in two-phase flow is clearly calculated by tracing the computing points on the bubble surface. A calculation model for surface tension force is presented using the curvature of radius. The volume decrease in a gas bubble due to surface tension force is successfully computed. A kernel function with a variable kernel size is introduced to allow local concentration of computing points. A two-dimensional heat diffusion problem is solved using the variable kernel size model, and the result agrees with the exact solution. The void generation process in superheated liquid is simulated using the present method. The calculated bubble growth rate exactly coincides with the analytical solution. Rising bubble shapes in viscous liquid are also simulated in two dimensions, and the estimated shapes show good agreement with those of experiments.