Simulating a hydrostatic fluid in Abaqus

[safa85]

Hi,I want to model a pressurised container using CPE4R elements for the wall and Hydrostatic fluid elements for the fluid inside.I think i should modify the input file to generate fluid elements.right? so, to do that i open the input file and make all the required modifications. But when i submit the job to analyze i have recived no result relating thr fluid, i mean Abaqus don not regard the fluid. Please if any one can solve this problem i am wait for him.