visc values

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pelijas
Posts: 6
Joined: Mon Mar 11, 2013 6:13 pm
Location: CMIMA

visc values

#1 Post by pelijas » Tue May 19, 2015 6:58 am

Hello,

I wonder why in the Benchmarks examples, the value of VISC2 is 5000, and in the rest of the test cases this value use to be 5.0 reaching a maximum of 100.0 in the Channel test. Why is so high?
Thanks

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kate
Posts: 3700
Joined: Wed Jul 02, 2003 5:29 pm
Location: IMS/UAF, USA

Re: visc values

#2 Post by kate » Tue May 19, 2015 4:42 pm

This thread should be moved to somewhere more appropriate... :arrow:

In general, you'd want the viscosity value to depend on the grid spacing as described here. The benchmark case is a toy problem in which one large value was used for a range of horizontal resolutions - so the damping is too high, but who cares.

pelijas
Posts: 6
Joined: Mon Mar 11, 2013 6:13 pm
Location: CMIMA

Re: visc values

#3 Post by pelijas » Thu May 21, 2015 11:42 am

Thanks!

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