Particle orientation

[cunco...@gmail.com]

Hello every one,

I have a question about the orientatin of particle.

I want to insert a cylindrical particle in may calcul domain. My input code is like below :

&MATL ID='IRSN_2 plastic', DENSITY=1832., CONDUCTIVITY=0.2, SPECIFIC_HEAT=1.5 /

&SURF ID='IRSN_2 shape', THICKNESS=0.007, LENGTH=0.1, MATL_ID='IRSN_2 plastic', GEOMETRY='CYLINDRICAL' /

&PART ID='IRSN_2 particle', SURF_ID='IRSN_2 shape', ORIENTATION=0,0,1, STATIC=.TRUE., PROP_ID='IRSN_2 picture' /

&PROP ID='IRSN_2 picture', SMOKEVIEW_ID='TUBE', SMOKEVIEW_PARAMETERS='L=0.1','D=0.014' /

&INIT ID='IRSN_2 position', XYZ=0.01,,0.,,0., N_PARTICLES=1, PART_ID='IRSN_2 particle' /

By default the axis of the cylinder is on x direction. I want to change it to y or z direction. Fierts of fall, i've try to change the ORIENTATION parameter to 1,0,0 or 0,1,0 but when i view the partical with smokview, nothing changes. So what is the real meaning of the ORIENTATION parameter and how to define the axial direction of the cylinder particle.

Thanks in advance!

[Kevin McGrattan]

The actual drawing of the cylinder is done in Smokeview, using SMOKEVIEW_PARAMETERS on the PROP line. Since these parameters are not used often, read the User's Guide and tell me if you can figure out how to do it. That is, I want to know if the instructions are clear.

[Glenn Forney]

Take a look at the tube entry in Table 19.6 in the FDS user's guide.  Use DIRX, DIRY and/or DIRZ to specify the direction you would like your tube to be oriented.   So to align your tube along the y axis use

SMOKEVIEW_PARAMETERS(1:3)='L=0.1','D=0.014','DIRY=1.0'   

You can use all three of these parameters to specify an arbitrary orientation.

Note, add the (1:3) after SMOKEVIEW_PARAMETERS .  This tells fds how many parameters to look for.  I'm not sure what happens if you leave it off.  

Like kevin says.  This feature of customizing smokeview objects is not used very often so report back if you have problems. 

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Glenn Forney

[Alex V]

Hi!

I have the same question regarding particle orientation and from the above, I'm still struggling with the correct answer.

I understand that the line

SMOKEVIEW_PARAMETERS(1:3)='L=0.1','D=0.014','DIRY=1.0'

is intended to draw a particle in SmokeView the way we want it to be (say, the cylinder axis is oriented along the Y-axis).

But what about the FDS calculations? 

The initial particle orientation is along the X-axis. Does the "ORIENTATION=0,1,0" parameter in a &PART line guide a cylindrical particle along the Y-axis? Or what would be the way to do it?

Thanks.

вторник, 28 мая 2019 г. в 15:59:23 UTC+2, Glenn Forney:

[dr_jfloyd]

ORIENTATION on &PART effects how radiation heat transfer is done (see 17.4.6) and for screen drag particles sets the flow direction the drag is imposed on (see 17.4.9).

[Alex V]

Thank you, Dr. Floyd. But my question is more about the possibility to insert in a model solid cylindrical particles and initially place them, for example, vertically, so the cylinder axis and the Z-axis are co-directed. I want to evaluate settling velocity here. What parameters are used in this situation?

вторник, 31 января 2023 г. в 12:19:27 UTC+1, dr_jfloyd:

[Alex V]

Hello!
I'd like to ask for some help regarding the following case.
I am currently investigating the influence of cylindrical particle orientation on settling velocity within a given volume. I have attempted to utilize RANDXY=1 and DIRZ=1 parameters, but the resulting data seem indistinguishable. However, the particle orientation in this case (non-spherical particles) should affect the sinking velocity.
Here are the code lines:

&HEAD CHID='CYL_PART'/
&TIME T_END=100.0/
&DUMP DT_DEVC=1.0, SMOKE3D=F/
&MISC POROUS_FLOOR=F/
&RADI RADIATION=F/

&MESH ID='Mesh', IJK=12,12,4, XB=-1.4,3.4,-2.4,2.4,0.0,1.6/

&PART ID='Dust PART', SURF_ID='Dust', DRAG_LAW='CYLINDER', PROP_ID='Tube'/
&PROP ID='Tube', SMOKEVIEW_ID='TUBE', SMOKEVIEW_PARAMETERS(1:6)='R=255','G=0','B=0','D=0.00002','L=0.0001','DIRZ=1'/

&MATL ID='CONCRETE', SPECIFIC_HEAT=1.04, CONDUCTIVITY=1.8, DENSITY=2280.0/

&SURF ID='Dust', MATL_ID(1,1)='CONCRETE', MATL_MASS_FRACTION(1,1)=1.0, THICKNESS(1)=0.00001, GEOMETRY='CYLINDRICAL', LENGTH=0.0001, INNER_RADIUS=0.0/

&INIT ID='Particle Point', PART_ID='Dust PART', N_PARTICLES=10, XYZ=0.51,-0.49,1.4, MULT_ID='Array'/
&MULT ID='Array', DX=0.02, DY=0.02, I_LOWER=0, I_UPPER=49, J_LOWER=0, J_UPPER=49/

&DEVC ID='DUST Control', QUANTITY='MPUV', PART_ID='Dust PART', SPATIAL_STATISTIC='VOLUME INTEGRAL', XB=-1.4,3.4,-2.4,2.4,0.4,1.6/

&TAIL /

Thank you in advance.

вторник, 31 января 2023 г. в 12:44:22 UTC+1, Alex V:

[dr_jfloyd]

This is beyond the capabilities of FDS. FDS does not model the moments of non-spherical particle. It cannot account for effects on drag due to any tumbling as a result of interactions between the particle and the flow field. 

[Kevin McGrattan]

Those parameters are purely for visualization in Smokeview.

[Aliaksei Patsekha]

Thanks for the answers. Now I got it.

пн, 5 июн. 2023 г. в 16:59, Kevin McGrattan <mcgr...@gmail.com>:

Those parameters are purely for visualization in Smokeview.

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