Burner Fluent simulation issues

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Most burners have air inlets located on the sides, but in order to simplify the model and reduce the number of grid elements, many people simply place the air inlet boundary and the fuel inlet boundary at the bottom of the burner. Such a result must be quite far from the actual value, right? After performing simulation calculations based on the actual model, I found that when the air inlet boundary is placed on the side, it is difficult for the results to converge, and the radial distribution of air within the furnace is very uneven. Since the burner uses natural ventilation, it is easy to understand why there is more air on the side where the air inlet is located. If the air inlet boundary is set at the bottom of the burner and the air volume remains constant, the simulation process converges easily. But, are such simulation results of any reference value? ? Those who have done burner simulations, please help clarify this for me. Thank you! !