We have an exciting announcement about badges coming in May 2025. Until then, we will temporarily stop issuing new badges for course completions and certifications. However, all completions will be recorded and fulfilled after May 2025.

Ansys Learning Forum › Forums › Discuss Simulation › Fluids › How to simulate consumption of tracer during combined internal/external flow sim › Reply To: How to simulate consumption of tracer during combined internal/external flow sim

October 16, 2024 at 7:00 pm
Kelsey O'Donnell
Subscriber

Hi Rob, thank you for your reply. Currently I am using an additional variable (as added and set up in CFX pre) as my "tracer". I have assigned it a diffusivity coefficient of 1.2e-9 and selected the diffusive transport equation to be solved. I also set the following boundary conditions:

Domain intialization: 0 kg/m^3 for tracer value

Velocity large inlet (on left of rectangular fluid domain): Velocity of 1 cm/s and tracer value of 0.1 kg/m^3

Velocity large outlet: Set as 0 Pa opening with zero flux

Mussel inlets: Velocity of 0.89 cm/s and tracer value of 0.05 kg/m^3

Mussel outlets: Velocity of 1 cm/s and tracer value of 0.025 kg/m^3

The mussel outlet and inlet are connected as the solid object has a fluid volume extracted from it and the outlet face area is 89% of the inlet face area hence the ratio of velocities (to maintain conservation of mass) 

Will this setup work or do I need to create a species and use that as my tracer as you suggested? I am not sure what expressions I should be creating for my mussel Inlet and outlet.