Modeling Pressure Drop Across a In Duct Air filter

Qkarl · August 2, 2021, 12:07

Hi All,

I'm going to simulate the pressure drop across a pleated air filter, which is install in a duct using fluent. I will conduct a full scale experiment where the air filter in install in a duct.

Since there are many repeated pleats in the air filter, I wonder is it possible for me to do a partial model CFD simulation, instead of the full scale simulation? for example, only simulate 4 pleats out of 64 pleats.

If I do a partial model CFD simulation, how do I consider the duct wall effect on the air flow? say if I'm using symmetry boundary.

Appreciate on the help. thanks

LoGaL · August 2, 2021, 12:11

Unfortunately I think you can't. If the filter is large enough, you may assume that in the middle the effect of the wall is negligible, so probably a cfd run with symmetry BC is fine. However this is not true for those parts near to the wall.

Qkarl · August 2, 2021, 12:27

Yes, initially I was thinking to do a full scale model, but it took a lot of memory and computational power. After doing some research, notice that there are some published paper, simulate a partial model to get the result, and I wonder if there is an alternative way to do so.

LoGaL · August 2, 2021, 13:06

No, I don't think there's a way to model the effect of the wall, either you include it in the model or you do not include it. As I said, if the filter is relatively large compared to the BL thickness on the wall, you may get away with a symmetry CFD run which is reasonably accurate.

August 2, 2021, 12:07	Modeling Pressure Drop Across a In Duct Air filter	#1
Qkarl Member Join Date: Apr 2017 Posts: 32 Rep Power: 9	Hi All, I'm going to simulate the pressure drop across a pleated air filter, which is install in a duct using fluent. I will conduct a full scale experiment where the air filter in install in a duct. Since there are many repeated pleats in the air filter, I wonder is it possible for me to do a partial model CFD simulation, instead of the full scale simulation? for example, only simulate 4 pleats out of 64 pleats. If I do a partial model CFD simulation, how do I consider the duct wall effect on the air flow? say if I'm using symmetry boundary. Appreciate on the help. thanks

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August 2, 2021, 12:11		#2
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 375 Rep Power: 12	Unfortunately I think you can't. If the filter is large enough, you may assume that in the middle the effect of the wall is negligible, so probably a cfd run with symmetry BC is fine. However this is not true for those parts near to the wall.

August 2, 2021, 12:27		#3
Qkarl Member Join Date: Apr 2017 Posts: 32 Rep Power: 9	Yes, initially I was thinking to do a full scale model, but it took a lot of memory and computational power. After doing some research, notice that there are some published paper, simulate a partial model to get the result, and I wonder if there is an alternative way to do so.

August 2, 2021, 13:06		#4
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 375 Rep Power: 12	No, I don't think there's a way to model the effect of the wall, either you include it in the model or you do not include it. As I said, if the filter is relatively large compared to the BL thickness on the wall, you may get away with a symmetry CFD run which is reasonably accurate.