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 lbc-types [2012/07/02 00:42]134.93.180.188 created lbc-types [2017/11/10 09:09] Line 1: Line 1: - ====== [LBC-TYPES] Section ====== - - ===== Purpose ===== - The lateral boundary conditions types (LBC) define the way ENVI-met handles the model boundaries.\\ - As the normal prognostic equations of the model cannot be applied to grid points on the model borders, other, more simple methods are used to obtain the needed values there. - - Three different kinds of LBC can be selected in ENVI-met: - - * **open LBC:**  The values of the next grid point close to the border are copied to the border each time step. - * **forced (or closed) LBC:** The values of the one dimensional model are copied to the border. - * **cyclic LBC:** The values of the downstream model border are copied to the upstream model border. - - You can choose the LBCs for temperature, humidity and for the turbulence variables. For the flow field, an open LBC will be used in any case. - - * [[Click here for more information about LBC types]] - - You can choose the LBC types by adding the [LBC-TYPES] section to your .CF file: - - - 00: [LBC-TYPES] ____Types of lateral boundary conditions - 01: LBC for T and q (1:open, 2:forced, 3:cyclic)  =1 - 02: LBC for TKE (1:open, 2:forced, 3:cyclic)      =2 - - - - ===== What do the lines mean? ===== - - === 01: LBC for T and q (Default 1=open) === - LBC type for temperature and humidity. 1 is open, 2 is forced and 3 is cyclic. - - - - === 02: LBC for TKE (Default 1=open) === - LBC type for the turbulence variables TKE (kinetic energy) and epsilon (dissipation rate). See above. - -