Eddy Heat Conduction and Nonlinear Stability of a Darcy Lapwood System Analysed by the Finite Spectral Method

Table 1

Sign control functions.

Range	𝑞<𝑗−NJ	𝑗−NJ<𝑞<0	0<𝑞<𝑗	𝑞>𝑗
𝑝<𝑖−NI	− +	+ +	+ −	− −
𝑖−NI>𝑝>0	− −	+ −	+ +	− +
0>𝑝>0	− −	+ +	+ −	− −
𝑝>𝑖	− −	+ −	+ +	− +
Name	𝑠1 𝑠2	𝑠1 𝑠2	𝑠1 𝑠2	𝑠1𝑠2