DPM Evaporation mass balance problem

herr010 · July 2, 2015, 21:14

Hello!!

I am running DPM simulation using 2-D Axisymmetric, Multicomponent Model.

I injec water-urea solution about 0.00038 kg/s and 380 parcels with 0.01 sec timestep.

I found that every injected particles are evaporated!! the temperature and the residance time is enough to evaporate every particles No escaped, No aborted, only evaportaed.

But when I see a 'mass flux report' , DPM Mass source is 0.000288 kg/s.

There is a big diffence between the mass I injected and the mass evapored in the domain.

I tried same simulation using a more dense mesh with double precision, the result is same.

how can i fix this?

herr010 · July 2, 2015, 22:37

Now, I am running same simulation on 3-dimensional mesh with same setting.

I found that the mass balance is correct.

The mass of evarporated particles is same to what I setting on boundary condition.

I think this problem is orruring at 2-dimensional axisymmetic.

July 2, 2015, 21:14	DPM Evaporation mass balance problem	#1
herr010 New Member HYUNGSIK UM Join Date: Jun 2015 Posts: 4 Rep Power: 10	Hello!! I am running DPM simulation using 2-D Axisymmetric, Multicomponent Model. I injec water-urea solution about 0.00038 kg/s and 380 parcels with 0.01 sec timestep. I found that every injected particles are evaporated!! the temperature and the residance time is enough to evaporate every particles No escaped, No aborted, only evaportaed. But when I see a 'mass flux report' , DPM Mass source is 0.000288 kg/s. There is a big diffence between the mass I injected and the mass evapored in the domain. I tried same simulation using a more dense mesh with double precision, the result is same. how can i fix this?

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July 2, 2015, 22:37		#2
herr010 New Member HYUNGSIK UM Join Date: Jun 2015 Posts: 4 Rep Power: 10	Now, I am running same simulation on 3-dimensional mesh with same setting. I found that the mass balance is correct. The mass of evarporated particles is same to what I setting on boundary condition. I think this problem is orruring at 2-dimensional axisymmetic.