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Core-annulus of solid volume fraction in gas-solid Circulating fluidized bed

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Old   April 5, 2012, 22:34
Default Core-annulus of solid volume fraction in gas-solid Circulating fluidized bed
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kong
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Hi:
I am simulating gas-solid flow in circulating fluidized bed.
in literature , nonuniform inlet can lead to a core-annulus solid volume fraction structure in radial profile.so i create a 6.5 jets inlet, which the 0.5 is from the center axis.
My problem is that i got the core-annulus structure, but the center has too big wiggling,which looks like resulted from the inlet. shown in the pic.
is there anyone has this experiences, how to solve the wiggling?

I am using e-e equation. and drag coefficient is from Syamlal O'Brien
the gas velocity is 3m/s and solid flux is 100kg/sm2

I just found increasing the gas velocity can make the wiggling relatively small but not much.

thank you
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