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Uturb in DieselFoam

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Old   June 5, 2009, 14:09
Default Uturb in DieselFoam
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xinguang cui
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Hey foamers:

I hope all of you have a nice weekend.
I would like to inquire you the " Uturb" in the parcel, which is used in the DieselFoam.
I read the source code, but it is sad that I didn't find where to solve the Uturb. Moreover, I also don't understand the function of the dispersionModel. Does it have some relation with the Uturb?

Thanks and best wishes!
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Old   June 7, 2009, 05:56
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Is there anybody know about the problem?
It is very small question, but it is very important.
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Old   June 8, 2009, 08:10
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Is there nobody to care about this problem? I am waiting for answer
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Old   June 8, 2009, 08:24
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have you checked for instance

src/lagrangian/dieselSpray/spraySubModels/dispersionModel/stochasticDispersionRAS/stochasticDispersionRAS.C

where Uturb is calculated.

When the parcel properties are to be updated Uturb is simply added to to the gaseous velocity in

src/lagrangian/dieselSpray/parcel/parcel.C

as
vector Up = sDB.UInterpolator().interpolate(position(), celli, facei)
+ Uturb();

so this will influence both drag and mass/heat transfer.
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Old   June 8, 2009, 14:59
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Thanks for your reply, and I have checked that instance. However, I am not sure whether the dispersionModel has relation with the Uturb.

And I think if I don't need to use the Uturb. I think I only need to set up the option of " dispersionModel " off. Is it right?

Thanks!
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Old   June 9, 2009, 01:59
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Quote:
Originally Posted by flying View Post
Thanks for your reply, and I have checked that instance. However, I am not sure whether the dispersionModel has relation with the Uturb.
Uturb is only from the dispersion model.

Quote:
Originally Posted by flying View Post
And I think if I don't need to use the Uturb. I think I only need to set up the option of " dispersionModel " off. Is it right?
that is correct.
setting it to off will result in Uturb = vector::zero.
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Old   June 9, 2009, 05:15
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Thanks! I am clear about it now.
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