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[waves2Foam] Reflection analysis for a flat wave flume |
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November 18, 2014, 13:25 |
Reflection analysis for a flat wave flume
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#1 |
Member
Hao Chen
Join Date: Aug 2014
Posts: 66
Rep Power: 0 |
Hi All:
I am doing a reflection analysis for a flat wave flume. I use stokes first order wave with H = 0.02 and T = 2s, the surface elevation seems reasonable but the reflection coefficients goes to 1.27 which is obvious wrong.... and I can not see why a0 goes to infinite... I attach the postprocessing file and the results: Code:
deleteParentOutputDirectory false; regularSpectrum { callName surfaceElevation; removeDuplicate true; inputDir surfaceElevation; deltaT 0.01; tMin 7.0; // Default: minimum time tMax 15.0; // Default: maximum time // indices 4 (2 3 4 5); // The action list is a set of processes on the data actionList (interpolateSurfaceElevation reflectionAnalysis2DLS write2Ascii removeData); depth 1; coordName x; // Removal of outputted data in the <callName> directory removeOF false; // Default value = true; removeAscii false; // Default value = false; waveNumber (1.2047 0 0); nFreq 6; period 2.0; allDataSets true; } Code:
1 0.0145989 1 0.00537883 2 -0.00140605 2 0.0220935 3 0.0194711 3 0.0464041 4 -0.0185462 4 0.0159688 5 0.00337293 5 0.00671671 6 -0.0866702 6 -0.0321751 0 -6.25e+13 Code:
1 -0.0279252 1 -0.00912701 2 0.0259962 2 -0.0131003 3 -0.0280987 3 0.0040698 4 0.033124 4 -0.017982 5 0.0243494 5 -0.00611838 6 -0.0167575 6 -0.0231503 0 -6.25e+13 Best regards Hao |
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November 18, 2014, 14:51 |
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#2 |
Senior Member
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Copenhagen, Denmark
Posts: 1,900
Rep Power: 37 |
Good evening Hao,
Your mean surface elevation (frequency index 0) is -6.25e+13, so you are probably doing something wrong. I cannot, however, come with any suggestions for improvements based on your information. Kind regards, Niels
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November 19, 2014, 05:11 |
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#3 |
Member
Hao Chen
Join Date: Aug 2014
Posts: 66
Rep Power: 0 |
Hi Niels:
Does this utility only use this input file or it also reads some data from other files like waveParameters? I check the interpolated surface elevation and there is one file called 'surfaceElevation_indexXYZ.txt' it looks like: Code:
0 -5e-09 5e-08 1.49418 1 1 0 0.3 2 2 0 0.3 3 3 0 0.3 4 4 0 0.3 5 5 0 0.3 6 6 0 0.3 7 7 0 0.3 8 8 0 0.3 9 9 0 0.3 10 10 0 0.3 11 11 0 0.3 12 12 0 0.3 13 13 0 0.3 14 14 0 0.3 15 15 0 0.3 Best regards Hao |
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March 21, 2016, 08:23 |
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#4 |
New Member
Giusy Palma
Join Date: Mar 2016
Posts: 1
Rep Power: 0 |
Hi Hao Chen,
I'm new in using OpenFOAM and I'm trying to perform the 2DFFT reflection analysis and the resultant value is greater than 1 as in your case (even if you used the LS method). Did you understand how to perform this analysis?? Can you help me? Giusy |
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November 29, 2018, 11:17 |
reflection coefficient
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#5 |
New Member
sanaz
Join Date: Jul 2016
Posts: 5
Rep Power: 9 |
Hi,
could somebody help me to calculate reflection coefficient? I did reflectionAnalysis2DLS, but I don't understand what is exactly the leftGoing and rightGoing results It would be very appreciated if somebody could send me the postProcessingPropertiesdictionary and tell me how to obtain reflection coefficient from the output! Sanaz |
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