I have a detailed ball grid modeled in my domain I want to use discrete ordinates radiation model but I don't want all the ball objects to be included in the radiation calculations or convectional calculation between the balls gaps.

You cannot unselect object from the discrete ordinate radiation model. You can however, encase them into a solid block with the material property of `air-solid`. This will make no difference in the results but the ball grid will not be used in the discrete ordinates calculation or the convectional calculations in between the ball grid. This will save time.

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