A holistic microclimate model

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apps:spaces [2021/03/19 10:16] – [Initial Settings] enviadminapps:spaces [2023/08/13 21:00] (current) – crm
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-{{:apps:icon_spaces.png? nolink 150|}} +<WRAP round box 95% center :en> 
-====== Spaces======+ 
 +<WRAP left 95%> 
 +<WRAP column 100px> {{:apps:icon_spaces.png? nolink 150|}} </WRAP> 
 +<fs x-large>**Spaces**</fs>
  
 The ENVI-met Suite program Spaces makes it possible to digitize your raster-based model area directly in the program or optimize the model area previously created in Monde or other programs.  The ENVI-met Suite program Spaces makes it possible to digitize your raster-based model area directly in the program or optimize the model area previously created in Monde or other programs. 
  
- ===== Initial Settings=====+</WRAP> 
 +</WRAP> 
 + 
 +===== Initial Settings=====
  
 As a first step after starting the program, you should, similar to most other ENVI-met Suite programs, pick the project will be working in. This way, the project-own materials will be available if you are using a project database.  As a first step after starting the program, you should, similar to most other ENVI-met Suite programs, pick the project will be working in. This way, the project-own materials will be available if you are using a project database. 
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 The **Model Geometry** allows you to define the amount x, y, and z grids and their respective resolutions. It also gives you the option to use //Splitting// and/or //Telescoping//, two options which are further described [[kb:verticalgrid|here]]. Splitting allows for a better resolution towards the ground of the simulation area, leading to more accurate results here. Telescoping makes it possible to reach a higher overall height of the model area without adding too many z grids. The telescoping should only start at a height higher or equal to your highest building, so that the buildings are still gridded correctly.  The **Model Geometry** allows you to define the amount x, y, and z grids and their respective resolutions. It also gives you the option to use //Splitting// and/or //Telescoping//, two options which are further described [[kb:verticalgrid|here]]. Splitting allows for a better resolution towards the ground of the simulation area, leading to more accurate results here. Telescoping makes it possible to reach a higher overall height of the model area without adding too many z grids. The telescoping should only start at a height higher or equal to your highest building, so that the buildings are still gridded correctly. 
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-===== Model borders ===== 
-Model areas should have a few cells at every model border where no building cells are digitized. Terrain, soil profiles, plants should still be digitized correctly. This recommendation should be fol-lowed to avoid a blocking / channeling of the wind flow at the borders which may cause large insta-bilities and crashes. How much open space is needed depends on the building density and building heights. As a rule of thumb, distance between model border and the first building should be half the size of the building height. That commonly leads to around 4-8 cells of open space at each bor-der. 
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 ===== Finding the right Vertical Gridding ===== ===== Finding the right Vertical Gridding =====
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 We use a combination of telescoping and splitting with a 5 m vertical resolution and the telescoping settings described in Solution A. We now only need 22 cells to reach more than 200 m in model area height. However, since we saved that many Z cells now, we could try to improve the stability even further and thus add some more Z cells to receive more free air cells above the highest building. We could also consider to decrease vertical resolution to 3 or 4 m again or choose a higher starting height for telescoping / use a lower telescoping factor. We use a combination of telescoping and splitting with a 5 m vertical resolution and the telescoping settings described in Solution A. We now only need 22 cells to reach more than 200 m in model area height. However, since we saved that many Z cells now, we could try to improve the stability even further and thus add some more Z cells to receive more free air cells above the highest building. We could also consider to decrease vertical resolution to 3 or 4 m again or choose a higher starting height for telescoping / use a lower telescoping factor.
 We strongly recommend to check those settings before you start digitizing your model area in de-tail. 3D information will be lost, if you need to reconvert from 3D mode to 2.5D in the end because vertical gridding needs to be changed. Use the “Model Inspector” found in Tools tab in Spaces to find the perfect vertical resolution for your model area. We strongly recommend to check those settings before you start digitizing your model area in de-tail. 3D information will be lost, if you need to reconvert from 3D mode to 2.5D in the end because vertical gridding needs to be changed. Use the “Model Inspector” found in Tools tab in Spaces to find the perfect vertical resolution for your model area.
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 +===== Model borders =====
 +Model areas should have a few cells at every model border where no building cells are digitized. Terrain, soil profiles, plants should still be digitized correctly. This recommendation should be fol-lowed to avoid a blocking / channeling of the wind flow at the borders which may cause large instabilities and crashes. How much open space is needed depends on the building density and building heights. As a rule of thumb, distance between model border and the first building should be half the size of the building height. That commonly leads to around 4-8 cells of open space at each border.