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Volume/domain activation and deactivation, welding

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Old   June 26, 2016, 08:03
Default Volume/domain activation and deactivation, welding
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Shahid Parvez
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Hi all
Is is possible to activate/deactivate (select/deselect) a particular portion of a volume or domain in CFX?
I want to simulate the weld pool shape after adding the filler metal and form a weld bead.
The volume/domain of the filler metal (shape of weld bead) is defined previously but is inactive and becomes active at the time when a heat source is applied.
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Old   June 26, 2016, 19:54
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Glenn Horrocks
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What do you want to activate/deactivate? Can you post an image of what you want to model? I am well aware of how welding works, but please explain how you propose to model it.
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Old   June 27, 2016, 09:24
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Shahid Parvez
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The filler metal melts, drops down on the work piece and form a bead.
I want to model this phenomenon in CFX with a simple approach adapted by various researchers.
Researchers model the weld bead geometry (mesh elements) in advance and keep the selected elements inactive (using Kill command in ANSYS Mechanical) and make it active (using birth command) as soon as heat source is applied.
Inactive means not participating in calculations or elements/volumes with zero stiffness.
Some information are available on the link bellow but unfortunately not for CFX. Can we do similar in CFX?

http://www.mece.ualberta.ca/tutorial...irthDeath.html

To explain it more,
suppose there is a plate (of 50x50x6mm) with flat surface. As soon as I apply a heat source (say after 1s of the start of simulation), a hemisphere volume (8mm dia and 1mm height) appears on the flat surface which represents the addition of a filler metal drop. Now this hemisphere was there in the mesh but was inactive at the start of simulation and becomes active after 1s.
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Old   June 27, 2016, 19:48
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Glenn Horrocks
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You cannot do cell birth and death in CFX. This sounds like a case for dynamic remeshing to me. Have a look at the ANSYS customer webpage for tutorial examples for this.
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Old   June 28, 2016, 07:23
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Shahid Parvez
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I appreciate your idea of dynamic re-meshing. It sounds applicable for the situation. Thanks for the help.
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