Implementing D2Q4 model

Dear all,

I would like to implement D2Q4 lattice in Palabos. However, it seems that in palabos the resting vector (at the center of the lattice) should be always c[0] otherwise palabos won’t work correctly. As there is no particle residing on the centre node in D2Q4 model, how can I implement it?

Any help would be much appreciated.

All the bests,