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November 4, 2024 at 3:22 pm
SR786
SubscriberHi I am modelling mixing of a tracer in water (two liquids miscible with one another) in a batch stirred tank based on an experiment using the species transport model. I have followed the usual steps which include:
- Computing flow field for primary liquid (water) using steady state solver & standard k-epsilon turbulence model.
- Activate species transport model, create mixture template for tracer & liquid. Assume tracer has same properties as bulk liquid & change diffusivity from default value to diffusivity of tracer in liquid.
- Patch small volume of tracer into computational domain.
- Freeze flow field, switch off flow & turbulence equations (solve only for one species transport equation). Activate transient solver.
- Create monitors of concentration at several locations in the tank, run simulation and estimate mixing time(s).
Prior to starting my simulation, I notice after patching the initial concentration of tracer (t=0) is ~1.64 kmol/m^3. For the experiment, the concentration of tracer is 0.51 kmol/m^3. How do I change the concentration of tracer so it exactly matches the concentration used in the experiment?
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November 4, 2024 at 3:37 pm
Rob
Forum ModeratorReplot with node values off: the mesh looks very coarse in that region so you may not be patching into as much of a volume as you think.Â
The patch is a mass into a volume. So, if you need a certain concentration you need to back calculate the mass into that volume to give the volume fraction. Note, in your experiment you add a known mass into the system, not a known concentration into a region of the tank.Â
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November 4, 2024 at 3:43 pm
SR786
SubscriberNo worries, thank you for the suggestion!
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