We improve the method calculating the bulk viscosity naturally and apply it to the density dependent model.
我们改进了计算体粘滞系数的方法使之更为自然并应用于密度依赖模型。
With regard to air viscosity, the law of time dependent displacement of elastic ball is studied in theory.
考虑到空气的粘性，理论计算了弹力球的运动位移随时间的变化规律。
Furthermore, the conclusion based on the constant viscosity coefficient is quite different from the density-dependent viscosity one.
另外，常粘性系数的情形与粘性依赖于密度的情形在结论上有很大不同。
Furthermore, the conclusion based on the constant viscosity coefficient is quite different from the density-dependent viscosity one.
另外，常粘性系数的情形与粘性依赖于密度的情形在结论上有很大不同。
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