somada141
Member level 1
Hello everyone,
Since my last post was viewed by 24 people and no one bothered to help in anyway I'll try to clarify my problem.
I am making a 3D FDTD code with Mur ABCs.
When I only use the pure FDTD formulas everythin works fine but when I enable the mur formulas on the boundaries then after a while of normal behavior an abnormal increase takes place
Here is a snapshot :
This is a 3D golden waveguide with two opening on the y axis. I have only enforced Mur at y=0 to make the difference between the Mur and its absence clear.
The boundaries at y=0 is 50 cells away from the wave guide meaning 3wavelengths away at 8GHz which is a great frequency for this waveguide.
Does anyone ANYONE AT ALL know what may have gone wrong? Has anyone seen anything similar .
Concerning the standard FDTD stability issues meaning the D (cell size) and Dt (time step) there are both covered by the standard equation by Allen tavlove. D is 15 times smaller than the wavelength and Dt is produced by D/(sqrt(3)*C).
Please someone help. If someone bothers to help me then I could help someone else with this method and its various shortcomings and problems.
Thanks in advance,
Adam
somada141@yahoo.gr
Since my last post was viewed by 24 people and no one bothered to help in anyway I'll try to clarify my problem.
I am making a 3D FDTD code with Mur ABCs.
When I only use the pure FDTD formulas everythin works fine but when I enable the mur formulas on the boundaries then after a while of normal behavior an abnormal increase takes place
Here is a snapshot :
This is a 3D golden waveguide with two opening on the y axis. I have only enforced Mur at y=0 to make the difference between the Mur and its absence clear.
The boundaries at y=0 is 50 cells away from the wave guide meaning 3wavelengths away at 8GHz which is a great frequency for this waveguide.
Does anyone ANYONE AT ALL know what may have gone wrong? Has anyone seen anything similar .
Concerning the standard FDTD stability issues meaning the D (cell size) and Dt (time step) there are both covered by the standard equation by Allen tavlove. D is 15 times smaller than the wavelength and Dt is produced by D/(sqrt(3)*C).
Please someone help. If someone bothers to help me then I could help someone else with this method and its various shortcomings and problems.
Thanks in advance,
Adam
somada141@yahoo.gr