initial volume
 

My model consists of initial volume domain, Vro. Additional volume, Vadditonal will added into this initial volume domain during time flow. Hence, the final volume, Vfinal will be Vro + Vadditional. I would like to calculate my initial domain, Vro when time flow=0 in my UDF for further calculation. I found that total volume +=C_VOLUME(c, t) is work for Vfinal as time flows. However, I do not know on writing UDF in calculating the Vro. Anyone please help me to solve my problem.

Thanks a lot.

Best regards