UDF Multiphase chemical reaction.

U1990 · April 4, 2021, 19:15

Hello, everyone.

I am trying to model a chemical reaction between two different fluids using Eulerian multiphase model. However, the reaction rate is calculated according to many correlations. I have writting a UDF code to incorporate this equations in model. But my problem is when I try to program the reaction between the specie 1 (in phase 1) with specie 2 (in phase 2).

How can I identify and select a specific specie in a phase?

I appreciate very much your help.

Yasser · April 5, 2021, 11:12

show what you have, so someone can suggest how to proceed

JeroenH · April 9, 2021, 04:04

I am not sure this is what you need, but you can get the index of a species in a mixture with the following bit of code (example is for oxygen):

Material *mat = THREAD_MATERIAL(t0);
int ind_O2 = mixture_specie_index(mat, "o2");

You can use this index to obtain the molecular weight or species mass fraction for example.

April 4, 2021, 19:15	UDF Multiphase chemical reaction.	#1
U1990 New Member U1990 Join Date: Apr 2021 Posts: 8 Rep Power: 5	Hello, everyone. I am trying to model a chemical reaction between two different fluids using Eulerian multiphase model. However, the reaction rate is calculated according to many correlations. I have writting a UDF code to incorporate this equations in model. But my problem is when I try to program the reaction between the specie 1 (in phase 1) with specie 2 (in phase 2). How can I identify and select a specific specie in a phase? I appreciate very much your help.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
UDF for accessing reaction rate of face of cells in a thread	Khan_CFD	Fluent UDF and Scheme Programming	5	June 15, 2020 11:04
UDF code help solve reaction rate equation palm oil	zirkov	Fluent UDF and Scheme Programming	0	February 13, 2017 11:34
UDF about reaction in fluent5.4	Mark	FLUENT	5	May 1, 2014 18:39
Segmentation fault in running alternateSteadyReactingFoam,why?	NewKid	OpenFOAM	18	January 20, 2011 17:55
UDF : Chemical Reaction in Catalytic Converter	adhimac	FLUENT	1	March 27, 2001 15:04

April 5, 2021, 11:12		#2
Yasser Member Yasser Selima Join Date: Mar 2009 Location: Canada Posts: 51 Rep Power: 19	show what you have, so someone can suggest how to proceed

April 9, 2021, 04:04		#3
JeroenH New Member Jeroen Join Date: Apr 2021 Posts: 17 Rep Power: 5	I am not sure this is what you need, but you can get the index of a species in a mixture with the following bit of code (example is for oxygen): Material *mat = THREAD_MATERIAL(t0); int ind_O2 = mixture_specie_index(mat, "o2"); You can use this index to obtain the molecular weight or species mass fraction for example.