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在考虑重力等体积力的情况下，区别如下：1）zeroGradient 2）fixedFluxPressure
入口边界条件？我有一个问题，最近看到一些模拟射流的把入口延长了一段，加了管内流动，用来避免喷管直接出口处的较大的梯度，东岳老师怎么看@东岳 ，不知道您的入口速度怎么给的
