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About tamim

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  1. AdH for Beginners

    Cameron, I very much appreciate your feedback and willingness to share some of your experience. I downloaded the components of the Microsoft HPC Pack SDK but it keeps giving the error that it needs to be installed on a local hard drive (the default directory is C:\Program Files\Microsoft HPC Pack 2012\). I'll see if I resolve this issue and install it. I'd be more than willing to share my data files for my model. there are several permutations that I tried to get it to run faster but 1 sec / 1 hr was as fast as I could get AdH to execute. Please provide me your preferred email address. Mine is tatayee@rivertec.com Thanks very much, Tamim
  2. AdH for Beginners

    Cameron, I really appreciate your thoughtful responses. I've been trying to apply your suggestions, with limited success. I had applied the density paving to generate my mesh (5100 elements) but I did just turn the adapt option off, which did improve run times. However, it is still running at a absurdly slow rate of 1 sec / 1 hr (simulation/run time). It really seems far too precise to use a time step of 0.0002 sec. I recall running 10,000-cell models with FESWMS on a Pentium II, which would converge in a few hours. I've been using the constant depth option for the hot start, which I am certain probably doesn't help with The next two of your suggestions that I am plan to try is the more coarse mesh and the multiple processors, the latter I am not sure how to accomplish. Does it require more than one computer or another processing chip? I have an Intel Core i7-3540M (3 GHz) processor on a Dell with 16 GB RAM and plenty of disk space, which has been very fast for all my GIS, CAD and WMS (with huge DEMs) applications, so my only conclusion is that AdH is extremely computationally dense. Thanks again for your very helpful advice and feedback, Tamim
  3. AdH for Beginners

    I've been using WMS for several years but I am new user of SMS, specifically, the AdH program implementation. Recalling that the learning curve is pretty substantial from my experience with WMS, I've gone through a similar self-taught process of going through the SMS and AdH User Manuals, Learning Center tutorials, video and SMS Wiki. I did follow the AdH Intro tutorial and successfully setup the model and executed it. However, after 1 hour of simulation time (out of the 36 hour) and a run-time of 3 hours, I aborted. The tutorial indicates that depending on the speed of your computer, the model will finish in 1 - 2 hours. My laptop is a Dell Latitude, 16 GB RAM, Intel Core i7 processor with plenty of disk space. Is this a hardware limitation or an issue of computational settings (which I left to default just like the tutorial)? The above resources helped me setup my model. I imported a AutoCAD .dwg file and created scatter points from the contours & created a mesh, which turned out to be extremely dense due to the excessive vertex points SMS generated as a result of the AutoCAD contour vertices. So as an alternative, I manually defined scatter points along known elevations/contours at a less refined spacing. I generated a mesh which looked much better in terms of shapes and density. I was able to define the materials designated on the basis of channel, overbanks, and paved surfaces and correspondingly defined the boundaries based on these designated areas. I created nodestrings to define the upstream and downstream boundary conditions as Total Discharge and Water Surface Elevations, respectively, that varied for a 6 hour simulation. I created the AdH Hot Start (depth/elevation). When I ran the AdH Model Check, it gives me the triangle bad aspect error (17 in all). Following the recommendation, I went back to change the aspect ratio from the default 0.04 to 0.1 and regenerated the mesh, which gave me even more bad aspect triangles. I couldn't manually merge triangles or convert them to quadralaterals. Is option available for AdH models? I've been spinning my wheels for the past couple of weeks, so I am officially stuck and in need of some guidance from experienced users and/or developers. Sorry for the verbosity & appreciate any constructive feedback, Tamim