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From: PARRISH, MICHAEL <MPARRISH@greenhorne.com>  20111229 17:22:26

From: Dhont Blaise <blaise.dhont@ep...>  20111223 08:28:14

Hi, I use a unstructured mesh generated by TRIANGLE software (and the BATTRI interface) as a input in SWAN. I often get the message: "Error: number of cells around vertex is smaller than 4 or larger than 10" Has someone an idea to limit the number of cell around a vertex in TRIANGLE? I went through a lot of documentation and couldn't find any solution to that problem except building the mesh again with slightly different parameters... I also tried to set the minimum angle to 36° (so that the maximum number of cell around a vertex is 10), but the mesh created has too many elements... Thanks a lot in advance for your help, Regards, Blaise ps: concerning my earlier message about refraction problems, I found a solution by changing the wave spectrum parameters. 
From: Stephanie Matthias <Stephanie.M<atthias@wa...>  20111215 16:38:03

Good evening, Dear Sir and Madame, We are looking for a support contact for the Software Swan. We hope, we've got the right email and you can help us further. If not, please give us another contact. Thanks a lot! We are faced with the task to develop a wave map for a lake in Switzerland (2 km wide, 30 km long). In a first step we have to evaluate the right software. Following problems are existing: 1) Create a map with wave heights with a certain return period. 2) Analysis of the wave height influenced by a building 3) Determining the risk of shallow water (sediment transport, erosion) 1.) It is very important that we have a program in which the inputoutput calculation process can be automated. There a few conditions have to be calculated. Is it possible to automated this in Swan? Is there a problem with the interface? Are pre and postprocessing modules necessary? Net generating tools and Graphic tools? 2) As far as I am informed, Swan based on a Spectral module. How accurate are the calculations for buildings? Is the superposition of waves considered? Can Modules be integrated, where the superposition will be better shown, such as Boussinsqmodel, which are timedependent? 3) Does it takes into account the effects of shallow water? As refraction? Is there a possibility to calculate the transport of sediments? Can a extra module be integrated for this problem ? Do you know if there are some classes " to learn Swan efficiently"? Thank you for your help! Best regards, Stephanie Matthias stephanie.matthias@...<mailto:stephanie.matthias@...> Staubli, Kurath & Partner AG Ingenieurbüro SIA USIC 8048 Zürich · Bachmattstrasse 53 · Tel. 043 336 40 50 · Fax 043 336 40 60 6300 Zug · Zeughausgasse 7a · Tel. 041 710 41 81 · Fax 041 710 41 45 sk@...<mailto:sk@...> · http://www.wasserbau.ch<http://www.wasserbau.ch/>; 
From: Dhont Blaise <blaise.dhont@ep...>  20111213 15:29:58

Hi, As part of my master thesis, I started using SWAN for modeling waves on a small lake (3 Km x 8 Km). I used BATTRI to generate a triangular unstructured mesh that is thinner on the edges of the lake (25 m, against 100 m in the middle of the lake). When I plot significant wave height resulting from a constant and uniform wind of 8 m/s blowing for 10 min, I obtain a strange result: waves get bigger and bigger as they move in the downwind direction (what is normal since the fetch gets more important), until a certain element where the wave height suddenly doubles (e.g. from 15 to 33 cm)! Few elements further, wave height deacrease a little bit (e.g. 28 cm) before starting to grow again. The maximum height is similar to the height the wave had when it grew suddenly (e.g. 33 cm). This happens only for low wind velocity (< 10 m/s). When I input small timesteps, the phenomenon is more important (I tried 10 min, 1min, 0.5 min and 0.015 min for a wind that blows for 10min). when I input a wind that last longer (e.g. 40 min ), the phenomenon is less important. For me, it looks like SWAN have convergence problems. Do someone have any suggestion to solve that problem? These are the last line of my .prt file (time step=0.015 min): Time of computation > 20110406.001000 in sec: 600. not possible to compute accuracy, first iteration accuracy OK in 98.62 % of wet grid points ( 99.50 % required) accuracy OK in 0.00 % of wet grid points ( 99.50 % required) accuracy OK in 99.91 % of wet grid points ( 99.50 % required) STOP The 0.00% doesn't seem right... My input is below. Thanks a lot for your help. Regards, Blaise Input: SET LEVEL 0.3 NAUTICAL MODE DYNAMIC TWODIMENSIONAL SET RHO 1000 CGRID UNSTRUCTURED CIRCLE 36 0.05 1 30 READ UNSTRUCTURED triangle 'mesh2poly_1ref1_triangle.3' INPGRID BOTTOM UNSTRUCTURED READINP BOTTOM 1 'BATY_PSGL_triangle.node' INITial ZERO WIND 8 200 GEN3 AGROW BREAKING WCAPPING FRICTION TRIAD QUADRUPL PROP BSBT NUMERIC STOPC npnts 99.5 NONSTAT mxitns 50 BLOCK 'COMPGRID' NOHEAD 'Morat.mat' LAY 3 XP YP DEP Hs TM01 COMPUTE 20110406.000000 0.015 Min 20110406.001000 STOP 
From: Blaise Dhont <blaise.dhont@e...>  20111205 10:42:52
