Piston movement-User function

pradeep6890 · August 19, 2015, 00:55

I tried using user defined function to provide translational motion of the piston using time-displacement steps. But i couldnt solve it. Kndly help me solve this simple case.

ghorrocks · August 19, 2015, 01:32

This is very simple to do. Define a CEL expression for piston location versus time, set the domain to moving mesh and define the piston face to have displacement of your CEL function.

pradeep6890 · August 19, 2015, 03:29

thats wat i did sir, but the plot says some error in defining the expression. kindly help me..

ghorrocks · August 19, 2015, 05:39

Posting what the error message says might make it easier for us......

While you are at it, also post an image of what you are modelling, an image of your mesh and your CCL.

August 19, 2015, 00:55	Piston movement-User function	#1
pradeep6890 Member Pradeep Join Date: Nov 2014 Posts: 45 Rep Power: 11	I tried using user defined function to provide translational motion of the piston using time-displacement steps. But i couldnt solve it. Kndly help me solve this simple case.

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August 19, 2015, 01:32		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	This is very simple to do. Define a CEL expression for piston location versus time, set the domain to moving mesh and define the piston face to have displacement of your CEL function.

August 19, 2015, 03:29		#3
pradeep6890 Member Pradeep Join Date: Nov 2014 Posts: 45 Rep Power: 11	thats wat i did sir, but the plot says some error in defining the expression. kindly help me..

August 19, 2015, 05:39		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Posting what the error message says might make it easier for us...... While you are at it, also post an image of what you are modelling, an image of your mesh and your CCL.