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Setting temperature initial condition at specific location

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Hello,

I'm trying to solve a porous media heat transfer problem. the geometry of the problem includes 10/200 meters rectangle, where I'm setting a linear temperature gradient by the following equation:

T=((10[m]-y)/10[m])*100 [K]+293.15[K]

which works fine, next I need to set at the middle node of the rectangle (at location x=100, y=5) a temperature perturbation different from the value imposed by the equation.

How do I do that?

I Hope I'm explaining myself well.

Best Regards

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