请问：为什么fluent计算两步就收敛?
一个稳态问题,每一步迭代相当的慢,计算两步以后收敛,显示如下：
iter continuity x-velocity y-velocity z-velocity energy do-intensi monitor-1 monitor-2 time/iter
1 1.0000e+00 1.0248e-07 1.1506e+10 7.4984e-11 2.7543e-06 1.#QNBe+00 0.0000e+00 0.0000e+00 6152:09:45 9999
reversed flow in 5 faces on pressure-outlet 14.
2 solution is converged
2 1.#QNBe+00 1.#QNBe+00 1.#QNBe+00 1.#QNBe+00 1.#QNBe+00 1.#QNBe+00 0.0000e+00 0.0000e+00 5099:32:08 9998