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Constraining the results between 0 and pi

Hi I am trying to model nematic liquid crystal behaviour under an electric field.

To do this I solve the following PDE.

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Where Image may be NSFW.
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is the angle of the liquid crystals with respect to the x axis. The direction of the liquid crystal is represented by the vector Image may be NSFW.
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. The main problem that I have is that for nematic liquid crystals n and -n are the same thing as such Image may be NSFW.
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is periodic and only values between 0 and pi should be allowed. Is there a way to constrain the results to only be within this range.


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