calculating tau -- CFD Online Discussion Forums

May 14, 2018, 08:57	calculating tau	#1
MNoCeZ New Member Join Date: Sep 2017 Posts: 12 Rep Power: 8	Hello together, i want to calculate the stress tensor with the following definition: $\tau_{ij}=2\mu \left(\frac{1}{2}\left(\frac{\partial u_{i}}{\partial x_{j}}+\frac{\partial u_{j}}{\partial x_{i}}\right)-\frac{1}{3}\frac{\partial u_{k}}{\partial x_{k}}\delta_{ij}\right)$ my first approach: calcTau = 2 mu (gradU + gradU.T()+1/3*diag(U)); the problem is diag(U), because it does not return the required format? I would be very grateful for your help.

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