## Gravitational experiments with a collisionless two-dimensional computer model |

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2000-particle system 2GmN loge 51 mesh 6600 computer system Actual stellar systems calculations centrifugal force collisional effects COLLISIONLESS TWO-DIMENSIONAL COMPUTER coordinate space Crab Nebula Data 6600 computer Dmax Equations 15 evolution in velocity expectation value Frank Hohl frequency of rotation gravitational field gravitational potential Hockney ref Hohl and Stephen impact parameter increase the number initial rotation equal initial solid-body rotation iteration method iterations per cycle kinetic energy Langley Research Center large number loge|z mass per unit mass rods MODEL By Frank n,m+l number of stars Park Langley Research Poisson equation potential cp(x,y potential energy purely gravitational effects results are shown Rj(t rod of mass rotation period shown in figure shows the evolution solving the Poisson structure similar system approaches system containing systems investigated total energy TWO-DIMENSIONAL COMPUTER MODEL two-dimensional model uniform circular distribution unit length velocity distribution velocity space Vj(t x,y space y o y o zero thermal velocity