  The impact of ion pressure anisotropy on the energy cascade rate of Hall-MHD
turbulence with bi-adiabatic ions and isothermal electrons is evaluated in
three-dimensional direct numerical simulations, using the exact law derived in
Simon and Sahraoui (2022). It is shown that pressure anisotropy can enhance or
reduce the cascade rate, depending on the scales, in comparison with the
prediction of the exact law with isotropic pressure, by an amount that
correlates well with pressure anisotropy $a_p=\frac{p_\perp}{p_\parallel}\neq1$
developing in simulations initialized with an isotropic pressure (${a_p}_0=1$).
A simulation with an initial pressure anisotropy, ${a_p}_0=4$, confirms this
trend, yielding a stronger impact on the cascade rate, both in the inertial
range and at larger scales, close to the forcing. Furthermore, a Fourier-based
numerical method to compute the exact laws in numerical simulations in the full
$(\ell_\perp,\ell_\parallel)$ scale separation plane is presented.
