February 2, 2022 at 11:00 amSardarSubscriber
I am doing DDPM in fluent. My flow simulation is steady and I want to find out the final distribution of particles across the stirred tank.
What I am looking for is to add [x] tons of a type of particle and see how it circulates in the domain of the tank. I am choosing group/surface, but there is no way I can introduce to the model the final total mass of powder.
In the window of the injection I have already defined, there is a "Total Flow Rate" of injection [Kg/s] that requires a user input. This just does not make sense as both my simulation and the particle tracking method are steady and unticked for "unsteady particle tracking" respectively.
How can I inject that amount of powder without having to deal with time?February 3, 2022 at 9:24 amRobAnsys EmployeeI'd be looking at the Eulerian model for this - with DDPM you're solving an Euler granular phase and it'll almost certainly be transient.
In answer to the question you can use a volume injection but will need transient particles. Set the start time at zero and the stop time such that only 1 lot of particles are injected, ie stop time is a bit bigger than one particle time step but lower than two.
February 3, 2022 at 11:56 amSardarSubscriberThis means injection span should outlive one particle timestep. Knowing exactly why is kinda beyond me, but that is for sure some invaluable information. Thank you so much, Rob.
February 3, 2022 at 1:37 pmDrAmineAnsys EmployeeYou can use Volume Injection and inject certain mass of particles into the domain. Please use for that release 22R1.
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