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On tetrahedral or unstructured meshes in general the refinement factor r can also be defined by (Roache, 1998) r21 = (N 1 N 2 ) 1/ D , (17) where Nk is the number of nodes or cells of the mesh and D the dimension of space. With the use of r ≠ 2 it has to be kept in mind that interpolation to the coarse grid is necessary and it has to be ensured that the interpolation error is smaller than the discretisation error to be analysed. The same interpolation problem arises if the correction to the fine grid solution is computed with the aid of equation (6) or (11).
Known Problems As known, at wind field calculations MISKAM uses first order upwind scheme with high numerical diffusion. 51 COST is an intergovernmental European framework for international cooperation between nationally funded research activities. COST creates scientific networks and enables scientists to collaborate in a wide spectrum of activities in research and technology. COST activities are administered by the COST Office. org COST action 732 “Quality Assurance of Microscale Meteorological Models” has been set up to improve and assure the quality of micro-scale meteorological models that are applied for predicting flow and transport processes in urban or industrial environments.
Horizontal dimensions: Borders around the investigated area would be approximately 10Hb (Hb is the characteristic height of the buildings) or 400 m (Lohmeyer, 2005). 48 If only one wind direction is investigated, 5Hb distance between inflow boundaries and investigated area is enough, and 10Hb is necessary to the outflow boundaries. Figure 1: MISKAM boundaries in multidirectional and one directional simulation if the roughness around the investigated area is homogeneous Roughness elements (block buildings with height of Hb) can be used in the border area located around the investigated area if the roughness around the investigated area is homogeneous.