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I have simulated the one building in OpenStudio. Building characteristics and load information is taken from example file of EnergyPlus. Initially , when I compared the results of OpenStudio with that of example file , there is almost 100% difference in values of Air change per hour. Then, I change the terrain field from "city" to blank in example file of EnergyPlus then there is only 2% difference in values. So can anyone tell me how to use and change terrain field option in OpenStudio? And Is this option very important in building simulation or not?

I have simulated the one building in OpenStudio. Building characteristics and load information is taken from example file of EnergyPlus. Initially , when I compared the results of OpenStudio with that of example file , there is almost 100% difference in values of Air change per hour. Then, I change the terrain field from "city" to blank in example file of EnergyPlus then there is only 2% difference in values. So can anyone tell me how to use and change terrain field option in OpenStudio? And Is this option very important in building simulation or not?