# UDS Unsteady with UDM

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 May 6, 2013, 19:47 UDS Unsteady with UDM #1 Member   Shashank Join Date: Apr 2011 Posts: 74 Rep Power: 15 Folks, I am trying to solve a UDS equation which has only the transient and the diffusive terms in it (no source or convective terms). This transient UDS equation should act in such a way that it smears a multiphase field variable (say, phi_old) and returns the newer multiphase field variable at the current time step (phi_new). If I calculate phi_old and store it in a UDM location (say, C_UDMI(c,t,0)), how should I use this phi_old to calculate phi_new? Thanks for your consideration.

 May 6, 2013, 21:24 #2 Senior Member   Join Date: Aug 2011 Posts: 421 Blog Entries: 1 Rep Power: 22 Are you looking for C_UDSI_M1?

 May 6, 2013, 21:45 #3 Member   Shashank Join Date: Apr 2011 Posts: 74 Rep Power: 15 Well, I am aware that C_UDSI_M1 stores the variable from the previous time step but how to use the following: At current time step, let's say: C_UDMI(c,t,0) = C_VOF(c,lt)*C_T(c,t); Now, for UDS equation: phi_old = C_UDMI(c,t,0); At future time (next time step): C_UDMI(c,t,1) = phi_new*C_T(c,t); If I use C_UDSI_M1, then how would I calculate C_UDMI(c,t,0) in the first place?

 May 15, 2013, 15:35 #4 Member   Shashank Join Date: Apr 2011 Posts: 74 Rep Power: 15 Does anybody know how to do this?

 Tags multiphase unsteady, udmi, uds diffusive

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