epsilon too smallepsilon too smallepsilon

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Fluent中使用DPM模型，设置壁面碰撞恢复系数为函数
时，用颗粒追踪时显示结果为epsilon too smallepsilon too smallepsilon too smallepsilon too smallepsilon too smallepsilon too smallepsilon too smallepsilon too smallnumber tracked =624, escaped =0, aborted =73, trapped = 0, evaporated = 0, incomplete = 451
是啥原因啊，为什么显示epsilon too small  求助啊