[radiation.boy]

i want to analyze the flow for the case ..when we are given a cube say 10m each side cube..this cube has one inlet at top and one outlet at bottom..it contain air at 2 bar pressure and temperature is 25c and heated air is blown with velocity of 5 m/s and temperature 100 c from top inlet and air comes out through outlet...well the problem is how to give the condition of temperature and pressure of the cube...these were initial condition for the cube after the air is inserted through inlet condition will change ...some one said me during giving boundary condition in gambit use interior and select all faces of cube and when u insert dis file into fluent den give these conditions to interior...but dis still does not work...fluent give me an error while reading interior of the cube.. plz plz try to solve me dis problem ..i will be very thank full to u peoples