Why is the 'lagrangian' folder not output for small particle size?

Fanchao · July 21, 2023, 14:05

I successfully simulated particle transport using the reactingParcelFoam solver in OpenFOAM v1912. The parcels were injected using the manual injection method, and each parcel contained only one particle. The particle size (diameter) was fixed at 1e-6 m.

However, when I attempted to change the particle size to be lower or equal to 0.7e-6 m, the 'lagrangian' folder disappeared. This folder contains important information for each particle, such as particle ID, position, velocity, temperature, etc.

Does anyone know how to configure the simulation to output the 'lagrangian' folder even for small particle sizes? Any assistance would be greatly appreciated.

oswald · August 3, 2023, 04:26

Are you sure that your particles are still in the domain at write time? Maybe they just evaporated or fell below a limit, e.g. for minParcelMass. You can try to change or add the latter in your cloud's constantProperties. It might be set to 1e-15 as a default, which could be in the range of your particles' mass.

July 21, 2023, 14:05	Why is the 'lagrangian' folder not output for small particle size?	#1
Fanchao New Member Fanchao Meng Join Date: Feb 2021 Location: Manchester Posts: 1 Rep Power: 0	I successfully simulated particle transport using the reactingParcelFoam solver in OpenFOAM v1912. The parcels were injected using the manual injection method, and each parcel contained only one particle. The particle size (diameter) was fixed at 1e-6 m. However, when I attempted to change the particle size to be lower or equal to 0.7e-6 m, the 'lagrangian' folder disappeared. This folder contains important information for each particle, such as particle ID, position, velocity, temperature, etc. Does anyone know how to configure the simulation to output the 'lagrangian' folder even for small particle sizes? Any assistance would be greatly appreciated.

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August 3, 2023, 04:26		#2
oswald Member Join Date: Sep 2010 Location: Leipzig, Germany Posts: 93 Rep Power: 15	Are you sure that your particles are still in the domain at write time? Maybe they just evaporated or fell below a limit, e.g. for minParcelMass. You can try to change or add the latter in your cloud's constantProperties. It might be set to 1e-15 as a default, which could be in the range of your particles' mass.