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Numerical and physical comparisons of two models of a gas centrifuge

机译:两种气体离心机模型的数值和物理比较

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We compare two models used to compute the internal hydrodynamics of a gas centrifuge. The scoop action is taken into account through boundary conditions on the flow entering the bowl of the centrifuge in the first model, and through sinks and drag forces in the chambers of the centrifuge in the second. The numerical approximations of the models are based on a finite volume scheme on staggered rectangular grids and on a fixed-point iterative method. Convergence of the approximations is studied numerically on a family of refined grids and comparisons of the two models are discussed for the Iguacu centrifuge. It appears that linear computations on rough grids are sufficient in the first model to correctly predict the separative power of the centrifuge, while other parameters like the return flow or the drag forces require finer meshes and non-linear computations in the second model.
机译:我们比较了用于计算气体离心机内部流体动力学的两个模型。在第一个模型中,通过进入离心机转鼓的流体的边界条件,在第二个模型中,通过离心机腔室中的下沉和拉力,考虑了铲斗的作用。模型的数值近似基于交错矩形网格上的有限体积方案和不动点迭代方法。在一组精制网格上对近似值的收敛性进行了数值研究,并针对伊瓜苏离心机讨论了两种模型的比较。似乎在第一个模型中对粗糙网格进行线性计算足以正确预测离心机的分离能力,而在第二个模型中,诸如回流或阻力等其他参数则需要更精细的网格和非线性计算。

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