• After witnessing the continued decrease of involvement in the SpotterNetwork staff in serving SN members with troubleshooting issues recently, I have unilaterally decided to terminate the relationship between SpotterNetwork's support and Stormtrack. I have witnessed multiple users unable to receive support weeks after initiating help threads on the forum. I find this lack of response from SpotterNetwork officials disappointing and a failure to hold up their end of the agreement that was made years ago, before I took over management of this site. In my opinion, having Stormtrack users sit and wait for so long to receive help on SpotterNetwork issues on the Stormtrack forums reflects poorly not only on SpotterNetwork, but on Stormtrack and (by association) me as well. Since the issue has not been satisfactorily addressed, I no longer wish for the Stormtrack forum to be associated with SpotterNetwork.

    I apologize to those who continue to have issues with the service and continue to see their issues left unaddressed. Please understand that the connection between ST and SN was put in place long before I had any say over it. But now that I am the "captain of this ship," it is within my right (nay, duty) to make adjustments as I see necessary. Ending this relationship is such an adjustment.

    For those who continue to need help, I recommend navigating a web browswer to SpotterNetwork's About page, and seeking the individuals listed on that page for all further inquiries about SpotterNetwork.

    From this moment forward, the SpotterNetwork sub-forum has been hidden/deleted and there will be no assurance that any SpotterNetwork issues brought up in any of Stormtrack's other sub-forums will be addressed. Do not rely on Stormtrack for help with SpotterNetwork issues.

    Sincerely, Jeff D.

Ballpark diffusion parameters for a thunderstorm scale model?

MClarkson

EF5
Joined
Sep 2, 2004
Messages
892
Location
Blacksburg, VA
Some of you must have more experience with diffusion than I do... so I'd appreciate some input. I have this 2d gridded model that I am creating, the aim of which is to model thunderstorms. It has a 20km domain, uses a C grid, fully compressible and non-hydrostatic etc etc. After a large amount of effort to make it computationally stable, it is finally working well and now I am adding diffusion. At a grid spacing in the range of 100-20m, both horizontally and vertically, what percentage of a grid square should be "shared" with its neighbors each second? .1%? 1%? 10%? This is a fairly high shear (especially in the updraft region), conditionally unstable environment. My exact diffusion coefficient is based on shear and stability, I am just looking for ballpark figures for now, to make sure I am at least thinking on the right scale.

Thanks!
 
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