Subtract fluid volume to simulate projectile?

mrnsmith · March 4, 2011, 19:08

I need to simulate a projectile in a cylinder fluid volume. I make a cylindrical fluid volume and then subtract the shape of the projectile correct? How do I do the subtracting part?

BrolY · March 7, 2011, 04:31

Which mesher do you use?
Do you want to do hexa or tetra mesh ?

mrnsmith · March 9, 2011, 23:06

I am not sure which mesh I want to use... does it matter at this point or can I wait to fool around with that once I get to the meshing step.

I was told I make a cylindrical fluid volume and then delete from it the shape of my projectile. Is that true at least? lol thanks

-mAx- · March 10, 2011, 03:45

With Gambit: create your cylinder (volume), create your projectile (volume)
Substract projectile from cylinder

BrolY · March 10, 2011, 04:26

With ICEM :
If you use tetra mesh, then put a material point inside your cylinder. If the projectile geometry is closed, it would not mesh the inside of this projectile.

If you use hexa mesh (blocking), then "cut" the shape of the projectile, and delete the blocks inside it.

March 4, 2011, 19:08	Subtract fluid volume to simulate projectile?	#1
mrnsmith New Member Nick Smith Join Date: Feb 2011 Posts: 4 Rep Power: 15	I need to simulate a projectile in a cylinder fluid volume. I make a cylindrical fluid volume and then subtract the shape of the projectile correct? How do I do the subtracting part?

March 10, 2011, 03:45		#4
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	With Gambit: create your cylinder (volume), create your projectile (volume) Substract projectile from cylinder __________________ In memory of my friend Hervé: CFD engineer & freerider Last edited by -mAx-; March 10, 2011 at 04:29.

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March 7, 2011, 04:31		#2
BrolY Senior Member AB Join Date: Sep 2009 Location: France Posts: 323 Rep Power: 22	Which mesher do you use? Do you want to do hexa or tetra mesh ?

March 9, 2011, 23:06		#3
mrnsmith New Member Nick Smith Join Date: Feb 2011 Posts: 4 Rep Power: 15	I am not sure which mesh I want to use... does it matter at this point or can I wait to fool around with that once I get to the meshing step. I was told I make a cylindrical fluid volume and then delete from it the shape of my projectile. Is that true at least? lol thanks

March 10, 2011, 04:26		#5
BrolY Senior Member AB Join Date: Sep 2009 Location: France Posts: 323 Rep Power: 22	With ICEM : If you use tetra mesh, then put a material point inside your cylinder. If the projectile geometry is closed, it would not mesh the inside of this projectile. If you use hexa mesh (blocking), then "cut" the shape of the projectile, and delete the blocks inside it.