# [Broken-dam prob. (SIMPLE, VOF)]

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 May 21, 2001, 04:27 [Broken-dam prob. (SIMPLE, VOF)] #1 Park Guest   Posts: n/a Hi. I have two questions about broken-dam problem. I use SIMPLE method with VOF. i) in inner iteration, can I solve algebraic eq. with SIP solver ? (need any other better solver ?) ii) How can I give proper initial condition ? (especially in pressure) Thanks.

 May 22, 2001, 03:38 Re: [Broken-dam prob. (SIMPLE, VOF)] #2 Onno Guest   Posts: n/a Regarding initial Pressures If your code is implemented correctly, you may initialise the pressures with zeros. As you are solving for unsteady flow you have to iterate each time step (inner loops) over the Simple loop till convergence. For the broken dam problem the initial velocities are zero. Thus the first momentum prediction consists of the gravity source term as the pressure gradients are zero. The first Simple calculation will now produce the Pressure field that is consistent with the gravity sources of the momentum prediction.

 May 22, 2001, 18:17 Re: [Broken-dam prob. (SIMPLE, VOF)] #3 Barney Guest   Posts: n/a 1) I find the SIP solver solves these types of problems but takes a few iterations to do so... 2) The Simple scheme takes in an initial guessed and uses the pressure correction equation to correct it... giving a better initial condition will only improve your convergence...maybe you mean boundary conditions???

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