Thanks go, as always, to the folks responsible for Free-DC, who make this possible by keeping score for us.ħ_126,051_Alan J. It allows networked computers to band together to act as a supercomputer. In the event we have any non-crunching AnandTech readers who happen to wander into this thread: Distributed Computing is where you allow your computing device (smartphones/tablets included) to work on things like medical research, mathematical stuff, sifting through telescope data to further the field of Astronomy, and many other 'citizen science' projects. Maybe because spring is in the air? (In some parts of this little world.) Also, perhaps I am mistaken, but it seems to me that a few more people than usual switched their favorite project recently. I attach my steering files.That's a lot of Amicable Numbers during past week! And a Gerasim spike too. I was wondering if there are any suggestions of how to solve this problem. So I think there are two possible ideas to solve the problem: avoid the excessive deposition in the loose nodes, or somehow avoid that the topographical gradients created by these depositions affect the hydrodynamics, but so far I have not been able to implement these ideas in solutions. I also noticed that when I used the scheme for advection of velocities of 1 my results are better than with 14. I tried to reduce the free surface gradient compatibility to zero, and the peaks in the hydrograph reduced a lot (see second attachment) but they have not disappeared completely. I also try changing to final volumes but the increase in computational time make it completely unfeasible for the project. I tried to refine the mesh in the areas of the tidal flats as suggested in the forum to reduced this sedimentation, but it didn't work. This problem per se is not the main limitiation for me, since I am interested in the general sedimentation pattern and this phenomenon is limited to some loose nodes, but I think they do induce the peaks in the hydrograph because of the huge topographical gradient they create between the nodes of the element. Gaia-X Summit with more than 5000 participants November 2020. Gaia-X Association submits founding documents. As it can be seen in attachment 1, in some loose nodes of my model I have a lot of deposition, with unphysical values.įrom a post I read in the forum ( they say that this unphysical sedimentation is due to an overestimation of velocities when we have an element with wet and dry nodes, and we use the finite element method. The German and French Ministries of Economic Affairs present the project Gaia-X June 2020. I think I have discovered the cause of these oscillations, as it is related to a second problem the model has. I still have not been able to solve the problem but I have some updates that maybe can help. I was wondering if you have any suggestions of why this happens. I ran only the hydraulic model and it is working fine, the problem arises when I couple telemac2d with Gaia. Also, I noticed that the peak increases a lot in sections downstream, reaching almost 3000 m3/s. As far as I noticed, there are no water level differences right before the peak triggers, nor a continuous sediment barrier across my river that make the effect of a dam. I couldn't find any triggers for this peak that looks almost like a dam break. These peaks coincide with the resuspension of my sediments. In figure 2 in the attachments you can notice that the hydrograph in my boundary condition (red line) is perfectly fine, but in a cross-section 700 m downstream, these huge unphysical discharges are presented (green line). First I thought that it was due to the erosion stress, but doing several tests varying this parameter I noticed that I always have this problem (in more or less extend depending on my parameters).Īnalysing the results I noticed that I have a huge peak in my discharge inside my reservoir, but this peak is not caused by my inflow boundary condition. I noticed that in some consecutive instants of my simulation I have an impressive amount of resuspension (see figure 1 in the attachments, the print screens are taken 2 days apart). I am modelling sedimentation in a reservoir due to suspended transport of cohesive sediments.
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