Re: [swash-users] SWASH Tracer Module - Spurious Velocities

[Thomas P. <t.p...@qu...>]

Hi all.

I am currently trying to get the SWASH tracer module working to simulate the advection and diffusion of a neutrally buoyant passive tracer. I have seen very little work in the literature modelling tracers with SWASH, limited to Hilgersom et al. 2018 (GMD - An axisymmetric non-hydrostatic model for double-diffusive water systems<https://gmd.copernicus.org/articles/11/521/2018/>). I have noticed some weird (seemingly stability related) spurious velocities that are generated when the tracer module is turned on. Since this is a passive tracer field (using SALINITY, but DENSITY = OFF), the difference between the two velocity fields should be zero but that is not the case. I've included the .sws files here. The tracer field is a small rectangle with values of 10 while everywhere else the salinity value is zero.

If anyone has any experience with the tracer module in SWASH that may be of assistance, it would be greatly appreciated!


Thanks,


Thomas Pendergast (he/him)
Ph.D. Candidate
BWRC Research Assistant
Queen's University
Department of Civil Engineering