Q-criteria colored by velocity magnitude

Hello everyone, I want to get the Isosurfaces of Q-criteria colored by velocity magnitude. And I used the Gradient filiter, but there is no option Q-criteria. Could someone give me some advice? The file is attached.

To compute Q-criterion (and Vorticity and Divergence) you have to enable the advanced filter properties. It’s a little gear icon right by the Delete and help (?) buttons in the Properties window.

Thanks a lot. I want to get span-average data across the z direction. Could you give me some advice?