Gil

Hi Morten, Thanks for your clarification. I have reviewed a lot of papers, but even in DTU papers (for example, Wind_resource_estimation.pdf, and Complex_terrain_wind_resource.pdf) both BZ and IBZ without any clear abbreviations were used. but now clear. Regarding WAsP-CFD, seems i get wrong. Flow Model: clearly says "The speed-up ratios calculated by the CFD model are dependent on topography only". one of the links above, also shows figure 2 and 3, BZ + IBL replaced by Ellipsys. however, i wait for your confirmation. Thanks again. BR, Gyeongil

Hi Morten, Thanks for your three answers and information of internal progress. I have already read the paper you have linked but maybe a good time to re-visit. The main reason to ask of this question was recently I learned that WAsP-CFD models of micro-terrain and roughness is not relevant. This made me confused because roughness is not used for running of WAsP-CFD. i did not expect three parameters (wind data, contour, roughess) can be separated like this. However, now i understood better. It would be great if WAsP team clarify more in details in WAsP.dk. Regarding IBZ, it is still not clearly stated anywhere but quite often mixed with BZ model, IBZ model. Therefore, I would like to ask the following. To my understanding BZ = Bessel-expansion on a zooming grid , IBZ = Integrated BZ. Can someone says BZ and IBZ are different? if yes, is it because BZ is based on Troen (1990) and then later many new features were implemented to BZ model? i would be appreciate if you clarify this as I could not find anywhere at all. Regards, Gyeongil

Hi Morten, it is good to hear that it was already recognized and fixed. thanks for the list as well. Regarding the sample data of Parque Ficticio "All four dataset (277.8 MB)", Could you please provide me the data earlier than you find the server or update links in the help? you can also send me via my email address if possible. That would be very much helpful as I am currently working on Projects and I need to review approaches/on how to use, following the videos in youtube. . Best regards, Gyeongil

Dear team, it seems the latest updated version of WAsP CFD viewer has a few bugs. - WAsP CFD Result Viewer (Version 1.3.0.55) following the link in https://www.wasp.dk/software/wasp-tools/wasp-cfd-result-viewer, i am refering to video files uploaded in Youtube channel : <Flow field> video file: ShowCFD demo 1 – Introduction file the file was loaded from ...\WAsP samples\WAsP 12\Wasp workspaces\ParqueFicticioCfdFiles\ however the figure in the software is not the same that is shown in the video file while figure matches with manual. for example, turbulence intensity, flow inclination and sigma U has NO transect view of the main view in the rectangular box. in addition, if i click wind direction, it shows pop-up error message. furthermore, there are some errors when the screen is zoomed-in and -out saying. // Exception occurred in showCFD 'plotScaleChange' routine TTransect.scale>Invalid floating point operation //<Site assessment> video file: ShowCFD demo 3 - Map-based site assessment the relevant file from Helpfile has already expired. // Each data set contains one WAsP CFD result file and additional site assessment input from one measurement station (except the first data set which includes data from the nearby PORT07 measurement station). PORT06 (71.3 MB) PORT08 (71.4 MB) PORT09 (66.5 MB) PORT10 (68.6 MB) All four dataset (277.8 MB) The download links will expire in September 2024. // it would be better if you could provide these files in the webpage or again in the link as those are used in help file. currently it did not work as it is specified. if possible could you please share those files here again? regards, Gyeongil

still no answers? it seems like the forest has not considered at all but it would be great if expert(s) could explain this clearly because it could not find many information on the internet.

to make more clear for question 1, which values do WAsP take from 3km to 30km if values from roughness lengths cannot be considered? , e.g. zero roughness value or last roughness value observed at 3km or something else?

Dear Morten, Thanks for your confirmation. it means that the WAsP wake model applies for the entire wind farm with the same values and no chances to separate the wake parameters for turbine groups. Thanks for screen dump and detailed explanations. as you pointed out, that was the my concerns "the terrain is complex and elevation difference is higher even though RIX numbers are not high". Regars, Gyeongil

Dear Morten, Thanks for your confirmation and answers. if "10 different roughness changes were observed by WAsP in short distances (let's say in 3km), WAsP did not consider roughness changes any further in distances" is true, then (Question 1) what is the impact on AEP if further distance roughness changes are not considered (e.g. from 3km up to 30km)? when I was in WAsP course in DTU, i have learned that most critical information of roughness chances is border (100 ~ 150 x Hub heights) as this affects in transition boundary layer. in this case it seems WAsP did not correctly consider. (Question 2) to my understanding roughness rose is not anymore valid since WAsP 11.x and later version. Does WAsP 12.x use now again roughness rose? Could you clarify two additional questions? Regards, Gyeongil

Dear Team, based on old knowledge and after discussion with a colleague, i am a bit confused about how WAsP handles many roughness changes in short distances. from a colleague, she mentioned if 10 different roughness changes were observed by WAsP in short distances (let's say in 3km), WAsP did not consider roughness changes any further in distances (in this case from 3km up to 20km - typical map size and boundary). is this true? Based on recent improvement and implementation of QGIS instead of Map editor, the user can digitize more detailed roughness. if the above is applied, then i am wondering the impact. could you explain me and advise me how WAsP handles many roughness changes in short distances? regards, Gyeongil

Dear Team, I have two masts at the site and more than 20 wind turbines are planned. during test simulation i found out wake calculations by two different masts are quite different and in the end energy level differences are also high. i have not used default settings of wake settings in PARK2 but try to adjust and simulate. one parts of turbine groups are close to mast 1 and another groups are close to mast 2. the elevation difference between mast 1 and 2 are almost 200m asl. that is why I considered it makes more sense to separate two groups. however, all wind turbines should be considered as a whole. Are there any way to calculate wakes by applying different wake parameters in a wind farm? i am thinking to make the results separately and merge together. but in this case, i should consider again the wake by each group. it would be great if you could advise me how to apply in WAsP. regards, Gyeongil

Dear Team, i am doing resource assessments in forest site with multi-masts mainly based on WAsP. Western and southern parts of the site have a steep slope > 16.7 degree, so that I ordered WAsP-CFD. i read most of forest issues in this forum and also from webpage: https://www.wasp.dk/software/wasp-cfd/flow-model to understand better of WAsP-CFD. However I still did not fully understand. I have some questions below. (Question 1) Are there any benefit of WAsP-CFD focusing on forest area? based on webpage above, it seems to me that WAsP-CFD use/interpret roughness data differently. (Question 2) if WAsP-CFD has zero benefit compared to WAsP in terms of forest, should I apply same displacement heights in WAsP-CFD that were applied to WAsP? (Question 3) based on WAsP, three main inputs are oro + rou + obs. How are obstacles dealt with in WAsP-CFD if they are not a part of input before run? My last WAsP course was long time ago and i have used 3rd party CFD tools to handle forest. i think that could be the reason why I am still confused to understand how WAsP-CFD works. Could you please advise/guide me with details? Thanks Gyeongil

Hi Rogier, Current menu shows the following: WASA Wind Atlas downloads --> WASA Observational Wind Atlas UPDATED (Dec 2018) : The WASA observational wind atlas contains observed (OWC) and generalized (GWC) wind atlas data sets for the 15 meteorological stations established and operated by the WASA project. Observed wind climate files from the 15 WASA stations. The data mostly cover an eight year period from November 2010 to September 2018 for the WASA 1 masts and a three-year period from November 2015 to October 2018 for the WASA 2 masts. The WAsP workspace WASA 1+2 validation 2018.wwh contains data and sample maps for the 15 meteorological stations in the Wind Atlas for South Africa. then they are linked to: Observed wind climate (OWC) Generalised wind climates (GWC) WAsP analysis of WASA stations (WWH) if you have those files, it would be great but if not, I think I need to download all data and process by myself. Thanks. Gyeongil

Dear team, i am trying to use WAsP for south African projects and found out many data is already available from webpage: https://wasadata.csir.co.za/. in the section "WASA Observational Wind Atlas" there are links to DTU servers but it seems not working anymore. // The following files are not yet available on the local server, but can be downloaded from the DTU server Observed wind climate (OWC) Generalised wind climates (GWC) WAsP analysis of WASA stations (WWH) // Are those data still available from DTU server? if yes, could you please provide me the new/updated links? if not, are there any way to download those data sets? please advise me. BR, Gyeongil