You see how the colours of the trajectories are fade when compared with the colours of the Temperature[K] bar, thanks in advance
You are likely looking through the transparent side of your part. If you make your view "wireframe" or look from the opposite side of your section or turn off geometry the colors will match the color bar.
I tried wire frame display, nothing changed
Try playing with your scene settings. Flow Sim plots are rendered as physical objects in the geometry space, they are affected by the lighting setup.
what happens if you hide the part completely?
also what scene are you using?
are you using software opengl (non supported graphics card?)
there is an icon that looks like a light, is that disabled or enabled?
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