请问reacf()函数是什么函数？

隐身猪

在沙子沉降模型中，求解沙粒表面作用力采用的是reacf(w)函数。w应该是速度u在Z轴的分量，那么reacf(w)指什么叻？
请高人指教，谢谢！

Vivi_Song

楼主可以查看软件的帮助文档，具体位置为COMSOL Multiphysics>Global and Local Definitions>Operators, Functions, and Variables>Special Operators.

隐身猪

已经弄明白了，谢谢楼上的帮助！
reacf()函数用法如下：

The Reacf Operator
?  The reaction force operator (reacf) is available when calculating integrals of reaction forces or fluxes.

?  Apply the reacf operator on the names of dependent variables when doing a surface integration. For example, in structural mechanics, with dependent variable u and v corresponding to x- and y-displacements, use reacf(u) and reacf(v) to access integrals of the reaction forces in the x- and y-direction, respectively.

?  You can disable access to the operator by clearing the Reaction forces check box in the Output section in the solver’s Settings window.

?  The reaction force operator is not available when using weak constraints.