Single Droplet Combustion (DPM)

nesdroplet · September 13, 2021, 09:11

Hello everyone!

Currently, I am working on single droplet combustion simulations. To perform this study, I am using DPM model in FLUENT (Version 2021 R1). Is the DPM model best suited for a single droplet, or for a larger number of droplets/particles??
Additionally, the static temperature results are a bit lower than excepted, could it be an influence on the mesh?

Best regards!

LoGaL · September 13, 2021, 19:44

For single droplet, I am not sure DPM gives you that much info… you basically have one really small particle in a large domain.

you sure you shouldn’t use something like VOF?

nesdroplet · September 15, 2021, 11:41

First of all, thank you for your response.

I am aware that VOF could be a better approach. However, for a fundamental study, I decided to start with DPM.

To ensure the single droplet combustion, I determine the injection taking into consideration the space between droplets related to mass flow that enters the combustion zone. For this analysis, I was considering to obtain the combustion time and burning rate.

Do you have any advice?

LoGaL · September 17, 2021, 10:15

Nop

. Also, since the DPM include a lot of modelling, your temperature difference could be for a lot of different reasons, last but not least the use of DPM itself. Also turbulence and combustion modelling play a role.

I guess it's part of your thesis to figure those things out.

imran99 · November 20, 2021, 04:29

can any one tell me how to calculate the non-dimensional diameter square of fuel droplet in convective environment and having evapouration and combustion with air in Ansys Fluent. what i calculate to find (d2/do2)??
I have take VOF model

September 13, 2021, 09:11	Single Droplet Combustion (DPM)	#1
nesdroplet New Member Ines Join Date: Sep 2021 Posts: 2 Rep Power: 0	Hello everyone! Currently, I am working on single droplet combustion simulations. To perform this study, I am using DPM model in FLUENT (Version 2021 R1). Is the DPM model best suited for a single droplet, or for a larger number of droplets/particles?? Additionally, the static temperature results are a bit lower than excepted, could it be an influence on the mesh? Best regards!

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September 13, 2021, 19:44		#2
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 375 Rep Power: 12	For single droplet, I am not sure DPM gives you that much info… you basically have one really small particle in a large domain. you sure you shouldn’t use something like VOF?

September 15, 2021, 11:41		#3
nesdroplet New Member Ines Join Date: Sep 2021 Posts: 2 Rep Power: 0	First of all, thank you for your response. I am aware that VOF could be a better approach. However, for a fundamental study, I decided to start with DPM. To ensure the single droplet combustion, I determine the injection taking into consideration the space between droplets related to mass flow that enters the combustion zone. For this analysis, I was considering to obtain the combustion time and burning rate. Do you have any advice?

September 17, 2021, 10:15		#4
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 375 Rep Power: 12	Nop . Also, since the DPM include a lot of modelling, your temperature difference could be for a lot of different reasons, last but not least the use of DPM itself. Also turbulence and combustion modelling play a role. I guess it's part of your thesis to figure those things out.

November 20, 2021, 04:29		#5
imran99 New Member Imran Ansari Join Date: Jun 2014 Location: Aligarh Muslim University Posts: 4 Rep Power: 12	can any one tell me how to calculate the non-dimensional diameter square of fuel droplet in convective environment and having evapouration and combustion with air in Ansys Fluent. what i calculate to find (d2/do2)?? I have take VOF model