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Dear Users,

I hope somebody could give me an advise on my query. I have tried to set up a different temperature values in the tank: the water tank temperature should be 4.3°C but at a source, that is based on the first level in a middle of the tank, is 0°C.
I have only started using CONDIM subroutine, but obviously doing something wrong, as I get 4.3 degree everywhere and at a source as well but wish to get 0 at source. Basically I am trying to create a fresh cold water discharge in a warm water tank. I have not included salinity yet, just temperature at the moment. I have searched the forum but all cases there are too advance for me yet as I am only beginner. Thank you.

Kind Regards!

Violeta

Hello,

We would need to see the steering file, to see if all keywords for the source (position, discharge, value of tracer...) are correctly given.

Regards,

Jean-Michel Hervouet

Dear Jean-Michel,

Thank you for your reply. I have rechecked all my run cases again and I think the temperature is ok, as I have seen on bottom level where source is placed the zero temperature and 4.3 in domain. However it did not apper zero when I got corss sections by postel. Maybe I placed it too low and the source was not included into cross section. Please see attached cas,F files and simulation images: one for horizontal level 1 where source is placed step 9 and another one is cross section where no zero temperature. The cross section is from place where source is, unless i entered coordinates wrong.

Also I have another question. It could be very simple and I am doing it wrong but I have not come across this on forum at all. If my domain is not dry from the very beginning why I get white colours in result simulations and only after few steps something is happening. The white colour is not a zero value as zero value is assigned to some other colour. I have another image attached (velocity profile) showing this issue. Maybe it is something with my Fudaa colour pallet setting but I do not get it all the time so I am not sure what it is.

Please advise. Thank you.

Kind Regards!

Violeta

Kind Regards!

Violeta

for some reason Cas file could not be attached to previous email, so here it is.

Thanks.

Kind Regards!

Violeta

Maybe it will work now.

Violeta

Hello,

You must think that only the quantity of tracer corresponding to the discharge and the time step enters in one time step, so at the beginning, and the more so because this quantity is in some sense averaged over the test function around the point to give the temperature, the value is probably very small.

Otherwise unless you have specific reasons for using SUPG I would prefer:

SCHEME FOR ADVECTION OF TRACERS : 5
SOLVER FOR DIFFUSION OF TRACERS : 1 (7 only useful for SUPG)

that will give you the monotonicity.

Another reason could be that the default value for :

ACCURACY FOR THE DIFFUSION OF TRACERS : 1.E-6

is not enough and you get 0 iterations at the beginning and nothing changes, because, to the 1.E-6 standard, the problem is already solved. You can try 1.E-9 to be sure.

With best regards,

Jean-Michel Hervouet

Dear Jean-Michel,

Thank you very much for such a quick response and your help. I will modify the cas file and will run it again. Thanks.

Kind Regards!

Violeta