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--- kb:faq [2015/05/30 23:01] – [Simulation Trouble Questions] enviadmin
+++ kb:faq [2022/10/03 18:06] (current) – enviadmin
@@ Line 25: / Line 25: @@
 !!! This feature is not implemented at the moment. If you cancel your simulation, you have to start from the beginning.
-??? Why is there no "dynamic" version of ENVI-met that uses the memory resources as they are needed for my grid?
+??? Can I use more than one CPU (core) to simulate with ENVI-met?
-!!! The main problem with dynamic versions is that the automatic code optimization does not work because the layout of the memory is unknown at compile time. But for a numerical model like ENVI-met code optimization is required, otherwise the model will run significantly slower.
+!!! Starting with Version 4.3 (Winter1718 Release) the SCIENCE and  BUSINESS Versions are able to run parallel code on many CPUs.
-??? Can I have larger or other designed versions of ENVI-met than 250x250x30 grids?
+??? Is it possible to simulate a whole city in ENVI-met?
-What about a 100 x 400 grid version? It is the same amount of grids...
-!!!The size 250x250x30 is the maximum size possible for a 32Bit application. Also, it is the maximum size that is reasonable as far as computation time is concerned. In the future will will think of methods for distributed computing which allows lager areas to be simulated.
+!!! By default, as a microscale model, ENVI-met is not designed to simulate very large areas such as an entire city.
-We provide ENVI-met as it is. We will not create special customized versions for you.
+You need to pick selected or typical areas and simulate those as case studies.
+Starting with V4.3, you might also simulate a (very) large area, but you need a (very) strong computer and a lot of memory.
-??? I have seen some model results from ENVI-met using features that I cannot find in my version....
+??? I have seen ENVI-met simulations covering a large domain with topography and with a coarse resolution. Does this work?
-There are papers about photocatalytic NO degration, water spray cooling or the cool TreePass. Where are they in my version?
-!!! There are two different versions of ENVI-met (see [[apps:envimet|ENVI-met]])
-  * Basic: The free software you can download
-  * Expert: An extended model with far more features than the basic version and including the latest developments. This version is about 4 year ahead of the basic version and is used exclusively in our consulting services.
-You can add the functionalities of the Professional version by buying a license from us. However, many advanced features are only in our Expert version which we use for consulting exclusively.
+!!! ENVI-met is a pure physical model. It was designed for high-resolution simulations, but the model physics will also work for much larger spaces and coarser grid resolutions. Hence, ENVI-met might also be used for mesoscale applications if the features of the domain can be represented within the digital domain concept used in ENVI-met (e.g. there are no mixed landuse options in ENVI-met).
+??? I am working in a consulting company/ architectural office. Can I use ENVI-met?
-??? Is it possible to simulate a whole city in ENVI-met?
+!!! In a commercial environment (that is any environment that aims to earn money, public or private) you need the BUSINESS license of ENVI-met to work.
-!!! As a microscale model, ENVI-met is not designed to simulate very large areas such as an entire city. You need to pick selected or typical areas and simulate those as case studies. You might also distribute a larger area over several simulation models, but in this case the individual patches will of course not know from each other and hence not reproduce cumulative features.
+??? I would like to use ENVI-met commercially. How can I get/buy a license?
-??? I have seen ENVI-met simulations covering a large domain with topography and with a coarse resolution. Does this work?
+!!! The price list and the feature of the different versions are listed on our download page. If you are interested, please drop us a mail under license[at]envi-met.com.
-!!! ENVI-met is a pure physical model. It was designed for high-resolution simulations, but the model physics will also work for much larger spaces and coarser grid resolutions. Hence, ENVI-met might also be used for mesoscale applications if the features of the domain can be represented within the digital domain concept used in ENVI-met (e.g. there are no mixed landuse options in ENVI-met).
+??? How do I get support?
+!!! There is a large number of documents, online help and video tutorials on our web page and it is growing constantly.
+In addition there is our online forum, but remember that this is not an online hotline. Some question might be answered, others not because they are too complex. Also this is intended as an exchange forum between users.
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 ??? When I look at the CPU load, ENVI-met uses only 50% (25%,...) of my computer. Why?
-!!!  ENVI-met only uses one thread for the simulation (see next 2 FAQ's). Hence, if your system has more than one CPU core, ENVI-met only uses one of the CPU cores. Although this single core is used a 100%, the overall usage is only 50% (or 25% if you have 4 cores, and so on) if the other cores are without tasks.
+!!!  ENVI-met up to and including 4.2 only uses one thread for the simulation (see next 2 FAQ's). Hence, if your system has more than one CPU core, ENVI-met only uses one of the CPU cores. Although this single core is used a 100%, the overall usage is only 50% (or 25% if you have 4 cores, and so on) if the other cores are without tasks.
+ENVI-met 4.3 and newer support parallel computing in the full editions.
 ??? Can I run more than one instance of ENVI-met?
-!!! Yes, if you have enough memory and enough CPU cores free. Every instance of ENVI-met requires one CPU core plus 1 core is needed by the operation system. So if you have 4 cores, you can theoretically run 3 ENVI-mets. Allow each ENVI-met a free memeory of 3 GB to be used.
+!!! Yes, if you have enough memory and enough CPU cores free. If you use ENVI-met in parallel mode, you may need to adjust the CPU loading (see docu of V4.3) So if you have 4 cores, you can theoretically run 3 ENVI-mets in single-core mode. Allow each ENVI-met a free memeory of 3 GB to be used.
-??? Can I distribute my ENVI-met run over several PCs or use more than one CPU in one computer?
+??? Can I distribute my ENVI-met run over several PCs?
 !!! Not at the moment.
-??? Is there a 64 Bit Version of ENVI-met?
+??? Is there a 32 Bit Version of ENVI-met?
-!!! Not at the moment.
+!!! No, ENVI-met will only run on 64Bit WINDOWS versions.