open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello,

I found in my Telemac2d (coupled with Sisyphe) model, the variable UNORM used in Sisyphe is different from the value of SQRT(U2D^2+V2D^2). For example, at one node I got

UNORM= 5.670205818685992E-004
SQRT(U2D^2+V2D^2)= 1.611503826817920E-004

So I'm wondering is UNORM the magnitude of velocity?

Kind regards,
Qilong

Hello,

Sorry for this stupid question. I used UNORM in subroutine CORSTR_SISYPHE but this is called ahead of CALL OS('X=N(Y,Z)',X=UNORM,Y=U2D,Z=V2D). So they are from different time step.

I also find that if I use U,V in CORSTR in Telemac2D, the value of SQRT(U^2+V^2) is different from SQRT(U2D^2+V2D^2) in Sisyphe and I haven't found the reason yet.

Kind regards,
Qilong

Hello,

Well there are several velocities used in a time step:

UN at time n
U at time n+1
UCONV which is in between and compatible with fluxes, for advection schemes.

so you might find differences between them.

REgards,

JMH

Thanks for your explanation!

Kind regards,
Qilong