October 8, 2023 at 7:52 amAbdullah HassanSubscriber
I am having an issue in ANSYS simulation. I am trying to do condensation of water vapor to water liquid but when I initialize the solution, it says latent heat cannot be less than zero.
I tried to search online & it comes to my knowledge that it is related to enthalpy.
as enthalpy of liquid is -2.858e+08 and
enthalpy for vapor is -2.418e+08 at standard temperature. so change in enthalpy is coming negative which means the latent heat is less than zero.
Can anyone help me, how to resolve this issue or what values I need to choose for enthalpies in this case.
NOTE: I already did the simulation for water boiling/evaporation and I didn't face such issue in that particular case.
October 9, 2023 at 9:02 amRobForum Moderator
If you're using the Evaporation/Condensation model the To and From phase matters. I always have to check the manual, but if you currently have the vapour in the To field switch that to the From field.
October 18, 2023 at 9:25 amAbdullah HassanSubscriber
I understand that, what I am trying to do is Condensation of water vapor at 100 C,
for this case
From phase should be "from vapor'
to phase should be like " to liquid".
when I did this, it said latent heat can not be less than zero.
but when I do the opposite
from = liquid
to = vapor
system doesn't shows any warning. Infact it also did the condensation upon putting water vapor at inlet volume fraction as 1.
I don't understand that. can you please help
October 18, 2023 at 11:52 amRobForum Moderator
It's because Fluent doesn't know which material is gas and which is liquid. All Fluent does is look at the material data and then add/remove energy based on the formation enthalpy. To get around this, the To and From phase definitions matter: hence my comment about checking.
- 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.
- legend min and max
- Ensight hot iron palette from an image
- Streamlines in EnSight using MRI data
- Import MRI data into Ensight
- FLUENT APPLICATIION ERROR
- Total Surface Heat Flux Calculation in Fluent
- Difference between “total pressure” and “absolute pressure”?
- Drop Test of a Water-Filled Tube
- Minimum Orthogonal Quality Less than 0.01 For Transonic Airfoil Flow Analysis
- obtaining pressure distribution by making points in ansys
© 2023 Copyright ANSYS, Inc. All rights reserved.