A holistic microclimate model

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kb:compute [2014/10/06 23:18] – [How does it work?] enviadminkb:compute [2014/10/07 00:18] – enviadmin
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 When you start to get in touch with ENVI-met, you should build **small** models, e.g. in the size of 30x30 grids. These models will run very quickly and you will get your results very soon. You will also get back negative feedback very soon, if your model cannot be simulated properly due to the selected settings or other issues. When you start to get in touch with ENVI-met, you should build **small** models, e.g. in the size of 30x30 grids. These models will run very quickly and you will get your results very soon. You will also get back negative feedback very soon, if your model cannot be simulated properly due to the selected settings or other issues.
  
-As you run simple simulation, you will more and more understand how the system works and which are the triggers and settings you need to modify to control your simulation. You will also see, that a numerical climate model is a highly non-linear system. Small issues, uncertainties or changes can lead to large changes or problems in the overall simulation, which is the famous [[wp>Butterfly_effect|Butterfly Effect]] in [[wp>Chaos_theory|Chaos Theory]]. +As you run simple simulations, you will more and more understand how the system works and which are the triggers and settings you need to modify to control your simulation. You will also see, that a numerical climate model is a highly non-linear system. Small issues, uncertainties or changes can lead to large changes or problems in the overall simulation, which is the famous [[wp>Butterfly_effect|Butterfly Effect]] in [[wp>Chaos_theory|Chaos Theory]]. 
  
 As a matter of fact, ENVI-met is not a "normal" computer program, in which every action has a clear result and the failure to produce a result or an error message is a software programming failure. In many cases, you will need a lot of thinking and analysing, why the model results are as they are. Besides a feeling for numerical models, this also requires knowledge in microclimate and atmospheric physics. As a matter of fact, ENVI-met is not a "normal" computer program, in which every action has a clear result and the failure to produce a result or an error message is a software programming failure. In many cases, you will need a lot of thinking and analysing, why the model results are as they are. Besides a feeling for numerical models, this also requires knowledge in microclimate and atmospheric physics.
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 When you run large models, you will occupy your computer, or at least parts of it, for a long time. Although -depending on your PC- it might be possible to run even large ENVI-met simulations on your PC and keep on using it for your daily work at the same time,  this is not recommended. It will significantly slow down both the ENVI-met simulation and your daily work. When you run large models, you will occupy your computer, or at least parts of it, for a long time. Although -depending on your PC- it might be possible to run even large ENVI-met simulations on your PC and keep on using it for your daily work at the same time,  this is not recommended. It will significantly slow down both the ENVI-met simulation and your daily work.
  
-Best choice is to have an own computing PC reserved for your ENVI-met simulations. Once installed, it doesn't require its own keyboard or monitor and you can access it through Remote Desktop programs. The only thing you need to di is to copy your ENVI-met files onto the calculation PC and copy back the results once they are finished. (And, in additon, you should check from time to time if your simulation is still running...).+Best choice is to have an own computing PC reserved for your ENVI-met simulations. Once installed, it doesn't require its own keyboard or monitor and you can access it through Remote Desktop programs. The only thing you need to do is to copy your ENVI-met files onto the calculation PC and copy back the results once they are finished. (And, in additon, you should check from time to time if your simulation is still running...).
  
 ===== Cloud Computing ===== ===== Cloud Computing =====
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 As ENVI-met runs on WINDOWS systems only, Microsoft Azure is the first choice, simply because they offer pre-configured machines running WINDOWS. Once registered, you can easily select between a number of recent WINDOWS versions (mostly the Server versions) plus you can select the hardware you would like to have. As "to have" means "to buy" this of course defines the cost of your cloud adventure. Selecting a PC with 12 cores and a i7 CPU for example will get pretty expensive. However, you will only be charged for the time the PC is actually up and working... As ENVI-met runs on WINDOWS systems only, Microsoft Azure is the first choice, simply because they offer pre-configured machines running WINDOWS. Once registered, you can easily select between a number of recent WINDOWS versions (mostly the Server versions) plus you can select the hardware you would like to have. As "to have" means "to buy" this of course defines the cost of your cloud adventure. Selecting a PC with 12 cores and a i7 CPU for example will get pretty expensive. However, you will only be charged for the time the PC is actually up and working...
  
-At the time, Microsoft offers a EUR 150 free depot for new registrants. That might be enough to run a couple of ENVI-met simulations for you. If you are part of the MSDN network, you will a recharge of at least EUR 75 each month for a very small membership fee. For universities or similar there are even better options for computing at low cost, both for research and [[http://azure.microsoft.com/en-us/community/education/|education]].+At the time, Microsoft offers a EUR 150 free depot for new registrants. That might be enough to run a couple of ENVI-met simulations for you. If you are part of the MSDN network, you will get a recharge of at least EUR 75 each month for a very small membership fee. For universities or similar there are even better options for computing at low cost, both for research and [[http://azure.microsoft.com/en-us/community/education/|education]].
  
 Once you have chosen your PC configuration you can start to create 1 to 1.000 copies of the PC system you have chosen, this can even be done using the Powershell.  You also need to configure a shared drive to which the model files and the calculated results will go. Once you have chosen your PC configuration you can start to create 1 to 1.000 copies of the PC system you have chosen, this can even be done using the Powershell.  You also need to configure a shared drive to which the model files and the calculated results will go.