June 26, 2018 at 5:10 amoliveira1820Subscriber
I have a 3 cm recipient with liquid water and air initially. Then I apply a 900W energy heat source in the middle, and water vapour forms near the source and condenses near the cooled walls. I expect that all the fluids mix and that phase and mass transfer between the gas/liquid water occurs. Notice that I expect a average pressure near to 30 bar, so there should be like 85% or more of liquid water and little gaseous water at the "end".
For what I saw in my research I can´t decide if the best option is Thermal Phase Change Model or Droplet Condensation Model. Can anybody help me?
June 28, 2018 at 12:44 pmDrAmineAnsys Employee
Hey, You will have to use the Thermal Phase Change model or your own mass transfer models. The Droplet Condensation Model is useful for situations where a dry or near saturation two-phase flow undergoes rapid pressure reduction leading to nucleation and subsequent droplet condensation.
June 28, 2018 at 3:35 pmoliveira1820Subscriber
Thank you!! One more thing, I suspect that the air, vapour water and liquid water have continuous separated domains, how can I be sure if the Free Surface model applies to my simulation or that the fluids mix or not and this model doens´t suit me?
June 29, 2018 at 11:49 amDrAmineAnsys Employee
Free surface model within the one fluid framework apply only if the flow is either dominated by gravity or drag or both but the "dispersed" fluid particles are in equilibrium with the continuous phases. That means this would match cases with regions of zero to low entrainment and discernible interface. With free surface activated you have additionally to afford for resolving the interface between the phases.
You can start with one fluid approach for momentum but separate temperature fields and enable thermal phase change.
July 2, 2018 at 2:57 amoliveira1820Subscriber
But how can i additionally to afford for resolving the interface between the phases?
- You must be logged in to reply to this topic.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Floating point exception in Fluent
- What are the differences between CFX and Fluent?
- Heat transfer coefficient
- Difference between K-epsilon and K-omega Turbulence Model
- Getting graph and tabular data from result in workbench mechanical
- The solver failed with a non-zero exit code of : 2
- Suppress Fluent to open with GUI while performing in journal file
- Mesh Interfaces in ANSYS FLUENT
- Time Step Size and Courant Number
- error: Received signal SIGSEGV
© 2023 Copyright ANSYS, Inc. All rights reserved.