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Villcent

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About Villcent

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  1. Hi @Torben Voigt, Thank you for your reply. However, I am facing the same issue as well with another model (3rd post in this topic). I am trying to calculate the RCS of a sphere with the radius of a few mm at a single THz frequency. The model attached (in the 3rd post) is a sphere with 4mm radius incident by a source at 2.52THz. The suggestion given by Mel (in the 4th post), which is increasing the mesh size to lam0/6.5, works for that model. Now I am planning to further increase the radius of the sphere to 6-10mm but this will cause the memory error again. Therefore, I am wondering if the mesh size can be further increased or there are other workarounds on this. I am concerned about the accuracy of the results when the meshing is too coarse. Thank you.
  2. Hi @mel Is there any rule of thumb that how coarse the mesh size can be for RCS? while still getting reliable results. PS: I'm planning to further increase the radius of the sphere but this would increase the electrical size of the model significantly. Thank you.
  3. Hi Mel Thank you for your previous reply. I have some memory issues as well when solving electrically large models. I am currently working on a task to calculate the RCS of a sphere at a few THz using MLFMM. I have attached the model that I was working on. When I tried to run the simulation on a single computer node, the simulation was terminated with the following error. Sphere (run on single node).zip “ERROR 3617: FEKO process was terminated by kill” From the error file of the job, I found the following message. However, in the feko .out file, the memory requirement is far less than the limit. =>> PBS: job killed: mem 133560896kb exceeded limit 125829120kb Therefore, I tried to run the simulation on two computer nodes instead. But this time, I received a different error. Sphere (run on 2 nodes).zip “ERROR 36772: Not enough memory available for dynamic allocation” Is there any way to overcome this problem? Is it not suitable to use MLFMM in this case? I have attached two different zip files which contain the output files from these two simulations. Any help would be much appreciated. Thanks. PS: the simulations were run on a computer cluster with PBSPro batch system.
  4. Hi, I am trying to solve a sphere at 1 THz with higher order basis function (HOBF) but I received the error below. I have tried different order settings (Auto, 3.5, 2.5, ...) and they gave the same error. "ERROR 47169: Internal FEKO error. Please notify the FEKO support team and provide the error number, preferably together with the FEKO input and output files." Does anyone know the cause of this error? The input and output files are attached below. Any help would be much appreciated. Thanks. RCS_Sphere_HOBF.zip
  5. Hi, I am trying to solve a sphere with MLFMM but I received the error below. I was able to solve the same model using the default solver (MoM) without getting any error. "ERROR 32476: Not enough memory available for dynamic allocation" I have attached a zip file which contains the input and output files. Any help would be much appreciated. Thanks. RCS_Sphere_MLFMM.zip
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