Modeling toxic material transport in open environment, but closer to buildings

Mehar · August 31, 2016, 05:30

Hi All,

I have a problem in hand, where I have to model toxic material transport in open environment involving wind, but releasing from some hole in a large scale building.
This toxic material could be heavy gases, particles or aerosols, or a mixture of all.
Further, I have to setup some kind of suction system around that building, which can capture this leaking material.
So the objective is to capture toxic material leaking from a building using an appropriately designed suction system, and calculate the capture efficiency
PS: building height, and width is about 80 meters, the domain size in wind direction is more than 1 km.

My question is, which strategy you think is appropriate or better to model this phenomena

(1) Simulate the flow first and then use passive scalar transport in that flow...
(2) Simulate the flow first and then use lagrangian particle tracking (assuming no particle influence on flow)
(3) Simulate the flow and particle transport simultaneously taking care of particle influence on flow also.
(4) Simulate using multiphase flow.

Hope someone can guide, and please let me know, if need more information.
Thank you

FMDenaro · August 31, 2016, 05:51

your problem is quite complex and the tool depends on what you really wanto to achieve...

The flow is turbulent and the large scale problem prevent using DNS. I don't know if you can try LES. DNS and LES would require a simoultaneous solving of the particle motion.
Maybe URANS can be more affordable for you. However that means you have a statistically averaged velocity field so that a lagrangian tracking follows only the averaged velocity...

Some tracking methods on oceanographic flows use RANS simulation for pollution tracking...

August 31, 2016, 05:30	Modeling toxic material transport in open environment, but closer to buildings	#1
Mehar New Member Sana Ullah Join Date: Sep 2014 Location: Daejeon,South Korea Posts: 28 Blog Entries: 2 Rep Power: 11	Hi All, I have a problem in hand, where I have to model toxic material transport in open environment involving wind, but releasing from some hole in a large scale building. This toxic material could be heavy gases, particles or aerosols, or a mixture of all. Further, I have to setup some kind of suction system around that building, which can capture this leaking material. So the objective is to capture toxic material leaking from a building using an appropriately designed suction system, and calculate the capture efficiency PS: building height, and width is about 80 meters, the domain size in wind direction is more than 1 km. My question is, which strategy you think is appropriate or better to model this phenomena (1) Simulate the flow first and then use passive scalar transport in that flow... (2) Simulate the flow first and then use lagrangian particle tracking (assuming no particle influence on flow) (3) Simulate the flow and particle transport simultaneously taking care of particle influence on flow also. (4) Simulate using multiphase flow. Hope someone can guide, and please let me know, if need more information. Thank you __________________ Mehar, Phd Scholar KAIST, Korea

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
mass flow in is not equal to mass flow out	saii	CFX	12	March 19, 2018 05:21
Adding material to CFX material library	marlon	CFX	2	October 16, 2016 09:33
Compression stoke is giving higher pressure than calculated	nickjuana	CFX	62	May 19, 2015 13:32
Constant velocity of the material	Sas	CFX	15	July 13, 2010 08:56
Two-Phase Buoyant Flow Issue	Miguel Baritto	CFX	4	August 31, 2006 12:02

August 31, 2016, 05:51		#2
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,768 Rep Power: 71	your problem is quite complex and the tool depends on what you really wanto to achieve... The flow is turbulent and the large scale problem prevent using DNS. I don't know if you can try LES. DNS and LES would require a simoultaneous solving of the particle motion. Maybe URANS can be more affordable for you. However that means you have a statistically averaged velocity field so that a lagrangian tracking follows only the averaged velocity... Some tracking methods on oceanographic flows use RANS simulation for pollution tracking...