-
-
March 9, 2023 at 7:03 pm
Mehrnoush Dardashti
SubscriberI am trying to simulate the evaporation of a falling droplet. Here is the link to the video that I want to simulate:
I followed the steps that are mentioned in a youtube video, but I wasn't successful. The main problem is the terminal velocity. I tried to use terminal velocity based on droplet radius. However, it doesn't change during the simulation.
Thanks.
-
March 10, 2023 at 9:43 am
Rob
Forum ModeratorPlease can you post what's happening in your model?
-
March 17, 2023 at 12:48 am
Mehrnoush Dardashti
SubscriberIt is a 2D model of water drop evaporation free falling in air by the simultaneous heat and mass transfer model. I used ANSYS Fluent 2021 R1 (2d, dp, pbns, eulerian, spe, lam, transient) Heat transfer: ranz-marshall, Mass transfer: mass transfer coefficient per phase, piecewise-liner saturation pressure [Pa].
https://youtu.be/i1p78532Ubg
I have two major problem :
- I attached the animation of volume fraction of droplet change here. as you can see after some time, the maximum volume fraction of droplet start decreasing. In my opinion, the evaporation must be from the surface of the droplet and the maximum volume fraction must be 1 (It shouldn't decrease).
- The air temperature here is 300 K. Based on analytical results it must take more than 5 seconds to evaporate droplet with this diameter (1 mm). As you can see from the video, the volume fraction of droplet decreases very fast. The total time of this video is 0.1 seconds.
-
March 17, 2023 at 11:59 am
Rob
Forum ModeratorRemember in 2d it's a circle, not a sphere. Check mesh and temperature. There's nothing in Fluent to fix evaporation to the surface only without coding it in.
-
- 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.

Ansys Blog
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?
- 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
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- Suppress Fluent to open with GUI while performing in journal file
- error: Received signal SIGSEGV
- Using GPU in FLUENT
-
8786
-
4658
-
3151
-
1680
-
1468
© 2023 Copyright ANSYS, Inc. All rights reserved.