隧道开挖流固耦合问题

xuetao0519

THERE IS ZERO VOL. FLUX EVERYWHERE IN THE MODEL BASED ON THE
             DEFAULT CRITERION. PLEASE CHECK THE VALUE OF THE AVERAGE VOL. FLUX
             DURING THE CURRENT ITERATION TO VERIFY THAT THE VOL. FLUX IS SMALL
             ENOUGH TO BE TREATED AS ZERO. IF NOT, PLEASE USE THE SOLUTION
             CONTROLS TO RESET THE CRITERION FOR ZERO VOL. FLUX.
不知道这个警告什么意思，结果引起了
***ERROR: TIME INCREMENT REQUIRED IS LESS THAN THE MINIMUM SPECIFIED

这个一般都会是什么原因