Error: Divergence detected in？

fluent中初始化后开始计算，一步都不能计算就出现如下错误： iter continuity x-velocity y-velocity energy time/iter # Divergence detected in AMG solver: x-momentum -> Increasing relaxation sweeps! Error: Divergence detected in AMG solver: x-momentum Error Object: #f 请大家给予建议，在此拜谢各位了