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November 25, 2020, 11:30 |
Velocity Gradient: Which component is which
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#1 |
New Member
Join Date: Oct 2019
Posts: 10
Rep Power: 6 |
Hello Foamers,
I want to work with the components of the velocity gradient tensor. I calculate the gradient via: fvc::grad(U) in OpenFoam-extend-4.0, but now I am unsure which component is which. Definitions of the velocity gradient tensor I find online state that for example the [1,3] component is du/dz. The Openfoam programmers guide (chapter 3.1.1) gives the transpose of this definition, saying that the [1,3] component is dw/dx (in terms of grad(U)) I am confused as to which one is right. How do I make sure I access the right components? I need du/dz and dv/dz. Does someone have experience with this? Thankyou very much in advance Kraneberger |
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November 26, 2020, 10:16 |
Solved
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#2 |
New Member
Join Date: Oct 2019
Posts: 10
Rep Power: 6 |
After doing some more checking myself I am certain that the Programmers Guide Definition is the one being used. The velocity gradient fvc::grad(U) is structured like this:
du/dx dv/dx dw/dx du/dy dv/dy dw/dy du/dz dv/dz dw/dz |
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Tags |
grad, grad u, openfoam-extend-4.0, tensor, velocity gradient |
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