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Hamsalekha

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About Hamsalekha

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  1. Thanks for your reply. After I constructed two combined sphere by changing the coordinate, I can't click the Union option. Now, after reading your reply stating as long as everything that touches belong the same part, I just combined two spheres and didn't modify anything since the two spheres are touching each other. However, when I meshed them and tried to run the simulation, I receive this error:
  2. Hi, I constructed a combination of two sphere. Initially, I faced some difficulty to combine two sphere using union but eventually I manage to do it by splitting it. In the first step, I initialized two spheres separately. I just combined them by changing the coordinates of the two spheres. Then, I used split command for both of the spheres and use union to combine all the spheres. After the split and union process, I set the region for both sphere as dielectric medium and set for FEM computation. However, when I wanted to create mesh, there were both triangular and tetrahedral mesh though I wanted only tetrahedral mesh. I also received the error message as shown below. Please help as I am not which part I have done error. I am not whether the error occur at the split, union process or in the initialization of the dielectric medium for the spherical region. Thank you
  3. Hi Matt, As Smitha said, it is an easier method to extract the result from the graph. You can also try option to export the file into .EFE format as well to analyse near field result. In CADFEKO, click advanced setting in "request near fields" option and there will be option to export the file into .EFE file. Thank you.
  4. Hi, I wish to set the permittivity of the background of the solid and permittivity for the solid sphere. I am not sure how to set the permittivity for both of the region. Can anyone help? In FEKO, can we set the permittivity for the background as well beside for the solid? Thank you.
  5. Dear Mel, Thank you for the information. Really appreciate your assistance. It was helpful. Thank you. Regards, Hamsalekha
  6. Hi, I wish to write a postfeko code where it can generate only near field results (Electric field magnitude and phase for theta and phi) and far field results (Electric field magnitude and phase for theta and phi and backscattering cross section value) for 256 configurations in one single text file. (Combinations of all 256 configurations in a single text file and also 2D Cartesian graph) I wrote this code (only for near field) but it is not working. The arrangement of the configurations are not in order and the results cannot be displayed in the Cartesian graph. My code -- To get started try the following script: names = pf.NearField.GetNames() printlist(names) for i = 1,256,1 do nearfieldi = pf.NearField.GetDataSet(names) print(nearfieldi) end return nearfield The output file has all the results of 256 configurations but there are other informations as well. So, it is impossible for me to extract the mentioned data one by one for 256 configurations and paste it in text file since its time consuming. The configurations are based on the theta and phi of incident and scattered field. I will attach the output file so that you can take a look on how the initializations are done and you can also refer to my previous forum discussion to understand the flow of the simulation. I hope anyone can assist me in this problem since it is an essential part of the investigation. Thank you output file of feko.txt
  7. Dear Mel, I face a problem on generating the lua code in the CADFEKO. There are two sets of code that I need to generate for 16x16 loop. For the first set, when I set the plane wave theta and phi value with 16x16 loop, it works. However, for the second set, the code is exactly same as the first set but the plane wave phi is set as zero. The code is successfully generated in the CADFEKO. However, an error appear in the POSTFEKO. The frequency is set as global frequency in the CADFEKO.Only a single frequency is used. However, this error appear. What is the modification that I need to do to make the POSTFEKO run successfully for the second set. As mentioned above, the first set of LUA code works. I will attach two sets of LUA code (CADFEKO script file) in the text file so that you can take a look on it. Really appreciate your help. Hope to hear from you soon. ps: Both set of CADFEKO LUA script are running perfectly on CADFEKO. The first set works well on POSTFEKO but the second set shows error as shown in figure above. Thank you. Regards, Hamsalekha SECOND SET OF CODE_ALTAIR FORUM.txt FIRST SET OF CODE_ALTAIR FORUM.txt
  8. Dear Mel, Thanks for the suggestion. Will try your options and let you know. Really appreciate your help. Thank you. Regards, Hamsalekha
  9. Dear Mel, There is no increment between points since the start and end theta and phi are fixed with the same values. The phi value of scattered near and far field are the same throughout the 16 configuration in one CADFEKO window. However, for different value of phi, I open another CADFEKO to generate the result. (There are 16 different values of phi to be generated based on Gaussian quadrature). For the plane wave, the increment of theta is based on Gaussian Quadrature rule. I have another question. Since there are many folders of CADFEKO (as shown in figure above), how to run all the POSTFEKO folders continuously without operating one by one manually? Do we need to prepare any batch file? How to prepare it in the POSTFEKO? Thank you. Regards, Hamsalekha
  10. Dear Mel, Sorry for late reply. I will write down my question properly and attach in this forum so that you can understand the questions. Thank you for your help. Regards, Hamsalekha FEKO_ALTAIR FORUM.pdf
  11. Hi, I have 16 sets of configuration in CADFEKO that generate near and far field in each set of configuration. Can I know how to generate a continuous result for near and far field in POSTFEKO? The result that I want is not in the form of Out file display but in the form of Cartesian graph. It is because results that are able to be plotted in the Cartesian graph can exported to clipboard as well. If there is a need to use parameter sweep in this case, can anyone help me on how to link parameter sweep with the multiple near and far field? The snapshot of the activity done in the CADFEKO and POSTFEKO will be attached as well. Hope to hear from you soon. Thank you. Each set of configuration has different scattered angle of near and far field. Image of POSTFEKO.
  12. I have to compute the back-scattering cross section of an ellipsoid using near field result (the electric and magnetic field). I used a formula is based on a thesis called A Microwave Scattering Model for An Electrically Dense Discrete Random Medium by Hong Tat Ewe. The formula is 10log10(4xpix(E_theta x H_phi)x intrinsic impedance)). I apologize if the formula is not clear since I am unable to upload the image of the formula. However, the formula is not applicable for the near field result from the FEKO. The formula is only applicable for the far field value. Can I know what are the formulations that were used to generate the near field data in FEKO? Thank you.
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