# Time Dependent Problem - Initial Conditions

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 August 10, 2005, 14:04 Time Dependent Problem - Initial Conditions #1 Willy Guest   Posts: n/a Hello, I have a small time dependent problem: a fluid is brought into a channel in a chip (it does not flow, it is already present) at a temperature of 40 °C. I want to know the time it takes to cool down the fluid (by conduction through the chip material) from 40 °C to an equilibrium temperature. The chip is cooled by natural convection with air at a constant T=20 °C. So this is only an energy dependent problem, but I have problems with defining the initial conditions. If I apply 40 °C as initial condition, then it is defined for fluid and chip, and my chip is initial at a lower temperature. How can I define those 2 different initial conditions for the fluid and the material? Do I need UDF's? Thanks a lot in advance, Willy

 August 10, 2005, 15:42 Re: Time Dependent Problem - Initial Conditions #2 Jason Guest   Posts: n/a You can define separate initial conditions with "patch" Solve->Initialize->Patch Hope this helps, and good luck, Jason

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