mixing 2 fluids

[JReinante]

hi, im having problems with this http://help.autodesk.com/view/SCDSE/2014/ENU/?guid=GUID-DCEC1333-ABBD-477F-9E33-FA3EE7A7EC0E, i understand everything , but i have the problem what says "two different fluids cant be in contact" some solution for this? thanks

[srhusain]

Hi:

To resolve this issue you must ensure that you assign the same fluid material (same properties) to all regions that are adjacent. For example, if two regions are adjacent, you cannot assign one to water and the other to oil- they must both be water or oil.

Hope this helps.

[JReinante]

im not understand, in some part, the fluid "A" needs enter to the vessel and in this part necessarily the fluid "A" touch the fluid "A+B"

[srhusain]

You cannot have fluid A and fluid B touching if these fluid materials are different (have different properties, for example density). If you have two parts touching, P and Q, you can only assign a single fluid to these parts. So, whatever fluid material you choose, you have to assign this material to both P and Q.

[apolo_vanderberg · Accepted solution]

JR,

   Some of the confusion of this comes from the fact that for SimCFD if you have 2 fluids mixing such taht you have A coming in one sectino and B coming in another, the way we set this up is via Scalar mixing.

What this means is that the entire domain will have a single material (we'll call it "Mixture" as an example).

Then if you modify this "Mixture" fluid you would set the Density/Visc/etc to be table driven and to Vary with respect to scalar

Set up the table as such

    Scalar    Density

    0           ## kg/m3 of Fluid A

    1           ## kg/m3 of Fluid B


Then on all inlets you will specify whether Scalar 1 (Fluid B) or Scalar 0 (Fluid A) is coming in to the domain at that opening.

Be sure to turn on Scalar mixing under the Advanced section, but otherwise this should get you moving forward.

[JReinante]

thanks