[yt-users] Error with derived field

[Nathan Butcher]

Hello Britton,

Running the script you posted, I found that no cells in a
smooth_covering_grid have a dPhidx value of zero, and that 4501200 cells in
a covering_grid have dPhidx of zero.

Nathan

On Sun, Jul 1, 2012 at 11:59 AM, Britton Smith <brittonsmith at gmail.com>wrote:

> Hi Nathan,
>
> This could be an issue with how you set up your covering_grid or
> smoothed_covering_grid.  Can you try out this script?
> http://paste.yt-project.org/show/2512/
> This depends on the script that you included in your post, so make sure
> it's in the same directory.  This will add up the number of cells in your
> grid object for which the dPhidx field is zero.
>
> Britton
>
> On Fri, Jun 29, 2012 at 3:19 PM, Nathan Butcher <butchernate at gmail.com>wrote:
>
>> Hello,
>>
>> I am having trouble using a derived field with a CoveringGrid. I am
>> making fields for dPhi/dx, dPhi/dy, dPhi/dz using the PotentialField from
>> ENZO. The derivative fields do not get passed into the CoveringGrid and get
>> recalculated. This leads to the derivative being zero in areas that were
>> originally in coarse cells.
>>
>> Density and DivV fields were passed to the CoveringGrid properly. As a
>> test I defined a field that was Density^2 and that was passed to the
>> CoveringGrid properly, so I think it is a problem specific to derived
>> fields based on the ENZO-specific PotentialField. I have included the
>> source for my derivative functions.
>>
>> Thank you,
>> Nathan Butcher
>>
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>>
>
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