volume correction
 

hello everyone.. i need help.. i have been trying to set up single point mooring simulation in flow3d. but this error can keep on appearing in my simulation. how should i correct it?

1)pressure iteration did not converge in itmax= 100 iterations
at time= 1.30126E-03 cycle= 1 iter= 100 delt= 1.30126E-03
epsi= 6.916E-02 maximum residual= 2.715E-01 at i= 221 j= 118 k= 33 block= 1
restarting cycle with smaller time-step size
present relaxation factor omega= 6.707E-01
present time-step size delt= 1.301E-03

2) and how should i ensure the volume of water in my simulation to be maintain at the same value from beginning to the end of simuation. is there any specific way?

hope you can help me out. thank you in advance