How to keep particle static in an efficient way?

MFiX
#1

Hi,
I am trying to simulate a process that the particle phase is static in the domain while the fluid passes through the particle layer. There are species transport between the fluid and solid phase. Now I use usr1_des to set the contact forces, gravity, and drag force as zero to keep particles static. However, the DEM solver still costs 4 s of 203 disperse particles each iteration.
I am thinking about whether there is a good way to accelerate this process.

Kind regards
Yuanhe

#2

I saw someone’s code solving this by defining a box region, and defining the solid particles to be in that region with max packed-bed volume fraction. That way the solid doesn’t move at all. But it messes up the pressure.

Jack

#3

@yueyuanhe were you able to find an efficient implementation for static particles? I am working on a similar setup and encountering the same issues.

#4

I did not find an efficient way. The attachment is the UDF to zero the particle force and can force the particle static.
usr1_des.f (1.5 KB)

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