Following Andrew’s explanation, I suppose that this is relation for which we’re 
lacking the factor of 1/2, right?

https://en.wikipedia.org/wiki/Angular_velocity#Angular_velocity_as_a_vector_field
 
<https://en.wikipedia.org/wiki/Angular_velocity#Angular_velocity_as_a_vector_field>

If so, then maybe we should link to this equation in the tutorial documentation 
too.

> If this is wrong in the deal.II code, would you be interested in writing a 
> patch to correct this? It should be an easy fix, and a good first patch to 
> contribute to the library!

I concur — it would be great if you’d be willing to write a patch that fixes 
this! It would be interesting to see the effect on the results of the tutorial.

Best,
Jean-Paul


> On 26. Jun 2021, at 05:58, Wolfgang Bangerth <bange...@colostate.edu> wrote:
> 
> On 6/24/21 6:32 PM, Michael Li wrote:
>> Andrew, thanks for confirming that. The missing 1/2 does not affect the 
>> demonstration of functionalities of deal.II but it may change the results.
> 
> If this is wrong in the deal.II code, would you be interested in writing a 
> patch to correct this? It should be an easy fix, and a good first patch to 
> contribute to the library!
> 
> If you're curious about ho to write a patch, take a look at
>  https://github.com/dealii/dealii/wiki/Contributing
> 
> Best
> W.
> 
> 
> -- 
> ------------------------------------------------------------------------
> Wolfgang Bangerth          email:                 bange...@colostate.edu
>                           www: http://www.math.colostate.edu/~bangerth/
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