Has any papers been written describing/modelling spacetime as a fluid? You also see diagrams of space time as a plane with the gravity coming from the dip in th

Has any papers been written describing/modelling spacetime as a fluid? You also see diagrams of space time as a plane with the gravity coming from the dip in that plane. But that model would hold in a 360 degree view, so I think we should model spacetime as a fluid with the density of that fluid going rise to drag and therefore gravity effects