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Using cylindrical implosions to investigate hydrodynamic instabilities in convergent geometry

Matter and Radiation at Extremes 2019年第6期4卷 13-21页

作者： J.P.Sauppe S.Palaniyappan E.N.Loomis J.L.kline k.a.flippo B.Srinivasan Los Alamos National Laboratory P.O.Box 1663Los AlamosNew Mexico 87545USA Virginia Polytechnic Institute and State University BlacksburgVirginia 24061USA

Hydrodynamic instabilities such as the Rayleigh–Taylor(RT)and Richtmyer–Meshkov instabilities disrupt inertial confinement fusion(ICF)implosions through the growth of 3D *** of these 3D imperfections at the interfaces of an ICF capsule during implosion lead to mixing between materials that is detrimental to *** instabilities have been studied extensively in planar geometry,but such experiments lack the effects of convergence in spherical *** several studies have been performed in spherical geometry,these often lack a direct means to measure perturbation *** in cylindrical geometry include convergence effects while maintaining direct diagnostic *** cylinders have less compression than spheres,they do provide an excellent platform to validate modeling for convergent *** problem with previous cylindrical implosion experiments was that the convergence ratios were limited to∼*** the National Ignition Facility(NIF),larger cylindrical targets can be driven to convergences of 10–15 while maintaining a large enough final diameter to measure perturbation *** paper reviews the design process used to both benchmark radiation hydrodynamics codes and enable 1D post-processed simulations to explore design space to separate compression effects from acceleration/deceleration RT *** from 1D simulations suggest that cylindrical implosions on the NIF can produce high-convergence experiments to validate RT instability growth for ICF implosions.

关键词： cylindrical geometry convergent

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Importance of Photo-Realistic and Dedicated Simulator in Agricultural Robotics

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Engineering（科研） 2023年第5期15卷 318-327页

作者： Hasib Mansur Stephen Welch Luke Dempsey Daniel flippo Department of Biological and Agricultural Engineering Kansas State University Manhattan USA Department of Agronomy Kansas State University Manhattan USA Marianna kistler Beach Museum of Art Kansas State University Manhattan USA

Agricultural robotics is a comparatively new field. Recently, it has gotten special attention because of agricultural labor shortages and rising labor costs. With the increasing operational use of agricultural robots, the need for a dedicated robotic simulator for such activity has been noted here. The need of a dedicated and specialty simulator for agricultural robotics research is the main focus area of this paper. Moreover, limitations have been pointed out when conventional robot simulators are used directly in agricultural settings. In a nutshell, it has been tried to emphasize that a dedicated simulator for agricultural robotics would be a timely advance and would accelerate the growth of agricultural robots.

关键词： Agriculture Photo-Realistic Robotics Robot Simulator Simulation

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Parameter space for magnetization effects in high-energy-density plasmas

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Matter and Radiation at Extremes 2021年第6期6卷 36-44页

作者： James D.Sadler Hui Li kirk.a.flippo Los Alamos National Laboratory Los AlamosNew Mexico 87545USA

Magnetic fields are well known to affect the evolution of fluids via the J3B force,where J is the current density and B is the magnetic *** force leads to the influence of magnetic fields on hydrodynamics(magnetohydrodynamics).Magnetic fields are often neglected in modeling of high-energy-density plasmas,since J 3 B is very small compared with the plasma pressure ***,many experiments lie in a separate part of parameter space where the plasma is indirectly affected via magnetization of the heat flux and charged particle *** is true even for initially unmagnetized plasmas,since misaligned density and temperature gradients can self-generate magnetic *** comparing terms in the induction equation,we go on to estimate the regions of parameter space where these self-generated fields are strong enough to affect the hydrodynamics.

关键词： field magnetization energy

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Primitive Geometry Tillage Modeling

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Open Journal of Soil Science 2016年第2期6卷 34-43页

作者： Elizabeth Frink Daniel flippo Ajay Sharda kansas State University Manhattan USA

Tillage practices have a significant effect on soil properties. Understanding the specific effects due to geometric and speed parameters of the tillage implement is the key to selecting a tillage practice that is best for a field. This is the first step of many towards optimizing an efficient tillage implement given initial field conditions and desired final conditions. Simple, small-scale tests were performed on idealized implement geometries as a proof-of-concept for future large-scale tests. The results of these tests are presented here and in-depth analysis will be presented in future work.

关键词： Tillage Automation Geometry Conservation

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