"discuss the effect" is grammatically correct and can be used in written English.
For example, "In our next class, we'll be discussing the effect of social media on youth mental health".
We will discuss the effect of the value k in the section "Discussion".
We now discuss the effect of experiment duration in the second paragraph of the Discussion.
We will discuss the effect of stimuli in more detail later on in this discussion.
Our correspondents discuss the effect this might have on British politics.
Near the end of the session, Tumlin pressed Hamilton to discuss the effect of the Administration's DACA decision.
Next, we discuss the effect of the grain size distribution.
In this subsection, we discuss the effect of parameters.
We will discuss the effect of the aseismic slip later.
We will discuss the effect of 60Fe in Section 4.4.
Following that, we discuss the effect of the Prandtl number Pr on the variation of θ.
Furthermore, we quantitatively discuss the effect of individual SWCNT length on electrical conductance and load transfer.
