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下面这个公式我应该如何写了 写成2*symm（fvc::grad(U))可以吗，或者是0.5 * (gradU + transpose(gradU))，还是说这两种都不对啊，请大佬指教
@kcol 2*symm(fvc::grad(U))，这么写没问题，注意括号是英文括号。湍流模型有写成twoSymm(fvc::grad(U))。
twoSymm(fvc::grad(U))正解
twoSymm(fvc::grad(U))
http://dyfluid.com/tensors.html
