June 17, 2021 at 10:23 amRaj007Subscriber
As explained in the title, I have 3 concentric cylinders (Just like a multi-coated wire) as a geometry. I have three different fluids to specify at each inlet of cylinders.
When I use a volume fraction as 1 in phase 2 and phase 3 at inlet 2 and inlet 3 respectively. I thought I would get Phase 1 from inlet 1 because I am leaving both the phases (2 and 3)volume fractions as 0.
But as a surprise, I got the phase 2 fluid distributed from Inlet 1. Could anyone explain to me how to assign 3 individual fluids in 3 individual inlets?
RajJune 17, 2021 at 10:44 amRobAnsys EmployeeIf the three fluids don't come into contact you don't need a multiphase model. Otherwise you set the volume fraction of the first two phases and the third is whatever isn't already accounted for.
June 17, 2021 at 12:59 pmRaj007SubscriberBut can I specify molecular weight for the material without using multiphase model?
June 17, 2021 at 1:42 pmDrAmineAnsys EmployeeMolecular weight is only required if you have species or dealing with phase change. If your fluids are flowing in different and separate zones (separated by walls) multiphase is not required.
June 17, 2021 at 1:50 pmRaj007SubscriberI have a solid polymer as a material. At a certain temperature, the solid will change into a liquid. So, I need molecular weight. In this case, can I use a multiphase model?
June 17, 2021 at 2:42 pmRobAnsys EmployeeDepends if that material also interacts with the other fluids. Have a look at the solidification & melting model in Fluent.
June 17, 2021 at 3:26 pmRaj007SubscriberI would like to clarify that I have separate zones (see[erated by walls) and the solid should be heated till glass transition temperature.
June 17, 2021 at 3:57 pmRobAnsys EmployeeIs the solid that's going to melt dividing the streams or encased in a separate domain?
June 17, 2021 at 7:18 pmRaj007Subscriberit is encased in separate domain
June 18, 2021 at 6:30 amDrAmineAnsys EmployeeIf your solid which is in separate DOMAIN will start melting you won't require a Multiphase Model in Fluent. You will require solidification and Melting model: Multiphase Approach built written a single phase approach.
June 20, 2021 at 9:19 amRaj007SubscriberThank you for the suggestion. But I could you brief this line "You will require solidification and Melting model: Multiphase Approach built written a single-phase approach"
June 21, 2021 at 6:23 amDrAmineAnsys EmployeeI can do it briefly but the documentation does that in a better way. Engineers tends to solve complex problems using assumption and simplifications. The Melting model is one of these simplifications to deal with phase change between solid and liquid in an efficient way deploying a porosity approach.
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