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anewman

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  1. Thank you for your assistance Stephen. I have now sent the files through to support.
  2. Hi, I have undertaken a simulation using TUFLOW HPC on a CPU, build version 2018-03-AD-iSP-w64. The model suffers from numerous repeat timesteps due to high control numbers, which are logged in the .hpc.tlf file; however the .tlf and .tsf files both state the following: "HPC HCN Repeated Timesteps == 0 ! HCN is High Control Numbers, eg. Courant Number exceedance HPC NaN Repeated Timesteps == 0 ! NaN - Not a Number means an instability occurred HPC NaN WARNING 2550 == 0" Is anyone else encountering this issue with reporting of repeat timesteps? Is there a fix for this, or will I just need to manually count the number of repeated timesteps recorded in the .hpc.tlf file each time I run a HPC model? Regards, Amanda
  3. Thanks for your explanation. Representing the floor of the building in a manner similar to a honeycomb is potentially an issue in terms of the impact that allowing the inside of the building to fill with water has on the modelled velocities under the structure and afflux caused by the structure. The potential impact caused by loss of storage from the building has been raised as an issue by the assessing authority. Is there currently any way of truly modelling a lid over the cell, i.e. the whole cell not just the sides, in TUFLOW? Or is it possible to change the storage of a cell above an elevation threshold? I need to account for the storage under the building, but am expected to show no storage inside the building (even though the building is not going to be fully water-tight). There are a couple of other projects waiting in the wings where I am expected to model flow under (and then ultimately around when water level exceeds floor level) large suspended buildings, so it would be helpful to know if this is something that the software presently supports or if the "blocked" part of the building will always actually be modelled as porous.
  4. I am using a 2d_lfcsh polygon to model a building constructed on piers. I have used a L1_pBlockage of 5, assuming the piers take up 5% of the available space beneath floor level. I have set L2_pBlockage to be 100, assuming no water can enter the building in the event of floodwaters exceeding floor level. My building is approximately 50 m long (in the direction of flow) and 20 m wide, and I am using a 3 m cell size. During the flood event, the building is not flooded above ceiling level, but is flooded above floor level - the peak flood level is about 2/3 of the way between floor and ceiling level. When I examine the lfcsh_uvpt check layer, the layer obverts and blockage factors of Layers 1 and 2 are as I expect them to be (i.e. reflecting the floor level and ceiling level of the building, showing 5% blockage under floor level and 100% blockage of the building above floor level). However, the peak water level under the centre of my building is reported as being above floor level and is similar to the level outside the building. Shouldn't my peak water level under the building be limited to the floor level of the building since the building is 100% blocked above floor level? Is anyone able to please shed some light on why I seem to have water entering the solid building? Is there a better way to model this building in 2D?
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