TELEMAC-MASCARET Forum: Negative viscosity for tracers (1/1)

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TOPIC: Negative viscosity for tracers

Negative viscosity for tracers 1 month 3 weeks ago #45561

crojas
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Hi,

I have a 3D model that has been validated with salt and currents. Recently, I started using the viscosity for tracers in the vertical axis (NAZ) and I noticed that I'm getting huge negative values in some regions and smaller positive values in other regions of the model. Is this normal? What can I do to work with these values? Ignore the negative? Ignore the positive?
Should I run the model again?

I'm using

VERTICAL TURBULENCE MODEL = 3
HORIZONTAL TURBULENCE MODEL = 3

Thanks in advance,
Cristian

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Negative viscosity for tracers 2 weeks 5 days ago #45676

pham
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Posts: 1559
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Hello Cristian,

Viscosity for tracer along z axis (NAZ) is computed in VISCKE subroutine from VISCVI%ADR(3) = C_mu*k**2/epsilon and COEFFICIENT FOR VERTICAL DIFFUSION OF TRACERS, so mainly dependent on k and epsilon.
It is strange that you get negative values for this variable.

Can you upload your steering file + potential Fortran files (in particular if you change something in CSTKEP subroutine).

Chi-Tuan

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