solidification seawater+ mass ransfer
 

Dear,
am a phd student working on the solidification of the binary alloy of water salt..and trying now to simulate it in fluent.....can you please help me to simulate the coupling between the solidification/melting model and the solute transport in fluent, i know that i must use UDS to integrate the solute transport equation but i cant find it.
I resume here my case;
in gambiti use a 2d square i export my .msh in fluent 6.2.16 then i set:
-define >>model>>solver>>segregated, 2D,unsteady
-define>>model>>multiphase >>>volume of fluid avec nombre de phases 2 >>>i dont know if it is true..i choose Implicit for VOF Scheme
-define >>model >>>energy ok
-define >>model>>viscous>>laminar
-define >>model>>solidification and melting ...ok and activate the compute of Pull velocity
- define >>userdefined >> function>>>compiled i define the viscosity in function of temperature...i use a seawater with 35g/l in salt so the liquidus temperature is 271K and the solidus is 252K....i wirte the c file compile it and load a libudf successfuly..
-dans define >>userdefined>>scalar ....i dont know what to put??;how many uds to put and with wich values?
-define >> material:
*i define a liquidmetal representing the seawater...in viscosite i put the udf , in UDS to define diffusivity i dont know what to put
*i took ice in second material and i dont know what to put in uds diffusivity
-define >>phase>> i put ice as a principl phase and seawater as second phase..
-in operating condition i add gravity
-in boundary conditions panel i put a fixed temperature in the cooled plane and in fluid i dont know how to put a source term???

sorry to be long, it s only to avoid you to ask questions.....please assist me in this setting..
thnks.