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Problem in solving Electro-Thermal Simulation



I am trying to perform a simulation on Electo-thermal problem (Like an EDM setup). The arrangement is like the tool(Copper), EDM oil (Fluid Media) and the Work piece (EN-19 Material), and respective boundary conditions are the tool and workpiece are subjected to a temperate of 50°C also the Voltage to the tool supplied is 25 V and the workpiece is at 0 V. I am looking for the result in tempature distrubution on the tool and workpiece. When I am trying to solve the problem the tempature through the workpiece and the tool is uniform. Secondly I am using the NX Thermal/Flow with analysis type Coupled Thermal Flow and Solution type Advance thermal Flow. 


Kindly help me in this regard.