mgolbazi
New member
Hi,
I am trying to simulate offshore wind farms using WRF wind farm parameterization (Fitch parametrization). I do two separate runs with the exact same setup except that one includes the wind turbines and the other one does not. My goal is to look at the difference between these two to understand the impact of the farms on wind speed.
When looking at the differences in the wind speeds between the two cases (with and without the wind farms), it seems like the turbines cause numerical noise in the model, which to some extend is acceptable. However, the noise seems to grow over time and result in some unrealistic and non-physical results. I attached an example plot at a certain time to this post. The turbines are at the coastal areas but the wind speed seems to increase/decrease significantly far away from the turbine areas.
The slight noise initially originates from the farms which is what I expected and propagates through the domain towards the boundaries. Eventually, the noise gets bigger and bigger and turns into unrealistic high/low wind areas.
My domain is a 400 by 400 grid and has a 4km grid resolution.
I have tried many domain configurations with different grid resolutions, one/two-way nesting, various microphysics options, reducing the time step, increasing or decreasing the number of the vertical layers, but none of them really worked. The only difference was that the large noises appeared at different times.
I also attached my latest namelist to this post.
I was wondering if you can help me with this problem. Any help is really appreciated!
Thank you,
Maryam
I am trying to simulate offshore wind farms using WRF wind farm parameterization (Fitch parametrization). I do two separate runs with the exact same setup except that one includes the wind turbines and the other one does not. My goal is to look at the difference between these two to understand the impact of the farms on wind speed.
When looking at the differences in the wind speeds between the two cases (with and without the wind farms), it seems like the turbines cause numerical noise in the model, which to some extend is acceptable. However, the noise seems to grow over time and result in some unrealistic and non-physical results. I attached an example plot at a certain time to this post. The turbines are at the coastal areas but the wind speed seems to increase/decrease significantly far away from the turbine areas.
The slight noise initially originates from the farms which is what I expected and propagates through the domain towards the boundaries. Eventually, the noise gets bigger and bigger and turns into unrealistic high/low wind areas.
My domain is a 400 by 400 grid and has a 4km grid resolution.
I have tried many domain configurations with different grid resolutions, one/two-way nesting, various microphysics options, reducing the time step, increasing or decreasing the number of the vertical layers, but none of them really worked. The only difference was that the large noises appeared at different times.
I also attached my latest namelist to this post.
I was wondering if you can help me with this problem. Any help is really appreciated!
Thank you,
Maryam
