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April 14, 2018, 09:59	Define Q in Python Calculator of Paraview	#1
Melvins New Member Chen Di Join Date: Apr 2014 Posts: 10 Rep Power: 12	Dear all, I intend to use Q-criterion or Lambda-2 to visualize vortex in Paraview, can anyone show me the correct code I should type in the expression box? For lambda-2, it should be something like "eigenvalue(strain(Velocity)2 + (Gradients – strain(Velocity))2), but there always appears syntax error. Please help, thank you in advance. Di

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