CFD-post

sjtusyc · September 10, 2012, 04:12

I did a spray simulation and wanna to get the Sauter Mean Diameter and diameter distribution at a specified area.
I read the documentation and do the tutorials ,but still can not find it .
Does anyone know how to achieve this.
Thank you.

sjtusyc · September 12, 2012, 04:13

Quote:

Originally Posted by sjtusyc

I did a spray simulation and wanna to get the Sauter Mean Diameter and diameter distribution at a specified area.
I read the documentation and do the tutorials ,but still can not find it .
Does anyone know how to achieve this.
Thank you.

Does anyone know about this ?

ghorrocks · September 12, 2012, 08:12

This is straight forward post processing. The SMD is a standard variable for apropriate multiphase simulations, so just plot the variable on the object you like. Or do a CEL expression on it, or what ever you want.

murx · September 12, 2012, 08:29

This should not be too hard to do with CEL expressions.

If you really want to calculate it for a specified area, that means you want something like a 2D sauter diameter, right? So particle area / interface length instead of particle volume/ interfacial area.

My idea for that would be to simply integrate the volume fraction over the area. That gives you the particle area (corresponding to the volume in 3D). To get the interface length (corresponding to the interfacial area in 3D) you could plot a contour, insert a polyline at a suitable contour level and then get the length of this line via CEL.

For a real 3D case you could use isovolumes and isosurfaces to get the volumes and surfaces of the particles.

EDIT:Or you could just use the SMD variable that Glenn mentioned and that I did not know about

sjtusyc · September 13, 2012, 09:50

Quote:

Originally Posted by ghorrocks

This is straight forward post processing. The SMD is a standard variable for apropriate multiphase simulations, so just plot the variable on the object you like. Or do a CEL expression on it, or what ever you want.

You mean i can set CEL like 'Sauter Mean Diameter@outlet?
I only find the averaged Sauter Mean Diameter in the variable list.
But if i want quantitative analysis,like:
100-120um ??%
120-140um ??%

September 10, 2012, 04:12	CFD-post	#1
sjtusyc Member leo Join Date: Jun 2012 Posts: 98 Rep Power: 13	I did a spray simulation and wanna to get the Sauter Mean Diameter and diameter distribution at a specified area. I read the documentation and do the tutorials ,but still can not find it . Does anyone know how to achieve this. Thank you.

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September 12, 2012, 08:12		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	This is straight forward post processing. The SMD is a standard variable for apropriate multiphase simulations, so just plot the variable on the object you like. Or do a CEL expression on it, or what ever you want.

September 12, 2012, 08:29		#4
murx Member Max Join Date: May 2011 Location: old europe Posts: 88 Rep Power: 14	This should not be too hard to do with CEL expressions. If you really want to calculate it for a specified area, that means you want something like a 2D sauter diameter, right? So particle area / interface length instead of particle volume/ interfacial area. My idea for that would be to simply integrate the volume fraction over the area. That gives you the particle area (corresponding to the volume in 3D). To get the interface length (corresponding to the interfacial area in 3D) you could plot a contour, insert a polyline at a suitable contour level and then get the length of this line via CEL. For a real 3D case you could use isovolumes and isosurfaces to get the volumes and surfaces of the particles. EDIT:Or you could just use the SMD variable that Glenn mentioned and that I did not know about