Learning Forum

[paulo_ruthemberg]

Hello everyone,

I'm trying to simulate the dissolution of salt (NaCl) in water using ANSYS Fluent, but I'm having trouble setting up the models correctly.

The goal is to simulate a simple 2D case where water flows between two salt walls, and the salt gradually dissolves over time. I'm attempting to model this process using the species transport model with wall surface reactions, but I'm not sure if this is the best approach. I would also like to track the concentration of dissolved NaCl in the fluid.

Here are the main difficulties I'm facing:

Fluent does not allow me to define solid species or activate wall surface reactions unless I first enable volumetric reactions;

The reaction between solid salt and water is not being accepted or applied correctly to the wall boundaries.

Has anyone successfully configured this type of solid–liquid dissolution in Fluent?
What is the correct procedure to:

Define a solid species and associate it with a wall;

Create a wall surface reaction that removes mass from the solid and adds it to the fluid;

Properly configure the mixture material for this type of system?

Any help, examples, or recommendations would be greatly appreciated.

Thank you in advance!