We computationally determine the net bed force on single spherical intruder particles in dense granular flows as a function of particle size, particle density, shear rate, overburden pressure, and gravity. A simple buoyancy-like scaling law is recovered (analogous to that in fluids), but with a scale factor that depends on the particle size ratio due to discrete contacts. Comparing the bed force with the intruder weight results in predictions of whether an intruder rises or sinks that agree with data from various independent experiments of free surface granular flows.

中文翻译：

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入侵者以密集的颗粒流上升和下沉

我们通过计算确定密集颗粒流中单个球形入侵者颗粒的净床力，它是颗粒大小，颗粒密度，剪切速率，上覆压力和重力的函数。恢复了一个简单的类似于浮力的水垢定律（类似于流体中的水垢定律），但是比例因子取决于离散接触导致的粒径比。将床力与入侵者的重量进行比较，可以预测入侵者是上升还是下降，这与自由表面颗粒流的各种独立实验得出的数据一致。