Flow-3D求解提示疑问

用Flow-3D做模拟分析中，求解过程中出现如下提示：
convective flux exceeded stability limit
at t= 1.3815E-02 cycle= 1058 iter= 4 delt= 2.6458E-06 mesh block 1
restarting cycle with smaller time step
pressure iteration did not converge in itmax= 100 iterations
at t= 1.9001E-02 cycle= 5987 block= 6 epsi= 8.2305E+02 resid=
1.5193E+03 delt= 1.0015E-07 nocon= 1
end of calculation at t= 1.912E-02 cycle = 7189
time-step < dtmin
convection failure diagnostics
time, cycle, delt, iter = 1.9021E-02 6154 1.7203E-07 4

最后模拟也进行完了，是不是这样的结果精确度不高
如果要改设置，如何改？只需要调整时间步长？收敛参数需要调整吗？如果需要，应如何调整？