Turbulent difussion in species transport

rodrigovime · February 17, 2022, 15:35

Hi, I'm making a calculation involving species transport and I tried to first establish the flow field and then turn on the species transport option WITHOUT solving simultaneously the fluid flow equations for each phase (3), but it seems that by doing this the species contours doesn't show turbulent diffusion behavior. Is there a way to include the turbulent diffusion and only solve the species transport equation?

LuckyTran · February 17, 2022, 17:15

Just for clarification, you have the option to check/uncheck the species equations yes?

You can freeze the flow solution and still get the turbulent species transport term. You can also freeze the flow and turbulence solvers. You just need the species transport solver still selected.

rodrigovime · February 17, 2022, 19:26

Thanks for your answer. Yes, I have the option of species transport on, but the contours show the same pattern of the velocity vectors. I'll try to freeze/unfreeze the flow equations to see if it changes.

February 17, 2022, 15:35	Turbulent difussion in species transport	#1
rodrigovime New Member Rodrigo Villarreal Join Date: Nov 2016 Posts: 29 Rep Power: 10	Hi, I'm making a calculation involving species transport and I tried to first establish the flow field and then turn on the species transport option WITHOUT solving simultaneously the fluid flow equations for each phase (3), but it seems that by doing this the species contours doesn't show turbulent diffusion behavior. Is there a way to include the turbulent diffusion and only solve the species transport equation?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Fixed Bed Gasifier, Species Transport Problem	therandomestname	FLUENT	12	January 4, 2019 08:08
Direct numerical simulation of species transport equation with phase change	Pmaroul	Main CFD Forum	2	October 12, 2018 17:02
Mixing tank, MF-VOF and Species Transport - Divergence Error	soheil_r7	Fluent Multiphase	0	September 11, 2018 06:29
species transport, two species with water prop's in micro channel, Solution Divergin	manoj.dundi	FLUENT	0	May 25, 2016 11:07
Questions for a species transport problems (snapshots attached)	aleisia	FLUENT	2	October 9, 2011 05:40

February 17, 2022, 17:15		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,762 Rep Power: 66	Just for clarification, you have the option to check/uncheck the species equations yes? You can freeze the flow solution and still get the turbulent species transport term. You can also freeze the flow and turbulence solvers. You just need the species transport solver still selected.

February 17, 2022, 19:26		#3
rodrigovime New Member Rodrigo Villarreal Join Date: Nov 2016 Posts: 29 Rep Power: 10	Thanks for your answer. Yes, I have the option of species transport on, but the contours show the same pattern of the velocity vectors. I'll try to freeze/unfreeze the flow equations to see if it changes.