[yt-users] velocity fields in yt

[j s oishi]

Hi Elizabeth,

I'm not quite sure what your question is at this point. Maybe you
should just report back when you've had a chance to work a bit on the
0.5*dx?


j


On Wed, Aug 3, 2011 at 2:52 PM, Elizabeth Tasker <taskere at mcmaster.ca> wrote:
> Maybe a similar scheme to that used for _DivV? So centre the velocity field
> by averaging the two face values in the appropriate direction within def
> _RadialVelocity?
>
> Ideally, I guess bulk_velocity would also be calculated using cell-centred
> quantities, but I think that is set by the user? In which case, it's up to
> them to decide whether to include the off-set (which for a large object is
> probably negligible).
>
>
> Matthew Turk wrote:
>>
>> Yes, it could be off by 0.5*dx.  To calculate it correctly, do you
>> need to center the velocity field by re-filling boundary values?
>>
>> On Wed, Aug 3, 2011 at 5:23 PM, Elizabeth Tasker <taskere at mcmaster.ca>
>> wrote:
>>
>>>
>>> Although actually, "RadialVelocity" is one place where it would also be
>>> an
>>> issue. It doesn't look like that is corrected for Zeus, if x-velocity etc
>>> are still face-centred. Am I reading that right?
>>>
>>>
>>>
>>> Elizabeth Tasker wrote:
>>>
>>>>
>>>> I was wondering if the x-velocity, y-velocity and z-velocity fields
>>>> themselves had been averaged to give a cell-centred quantity. There's no
>>>> need for them to be so, I just needed to know before I calculated a
>>>> cross-product to find the rotational potential of clouds I'd picked out.
>>>>
>>>> Thank you for the clarification :)
>>>>
>>>> Elizabeth
>>>>
>>>>
>>>> Matthew Turk wrote:
>>>>
>>>>>
>>>>> Only in the DivV and VoritictySquared fields.  Where else should it be
>>>>> made?
>>>>>
>>>>> On Wed, Aug 3, 2011 at 5:04 PM, Elizabeth Tasker <taskere at mcmaster.ca>
>>>>> wrote:
>>>>>
>>>>>
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> Quick question about the baryon velocity fields in yt: has any
>>>>>> correction
>>>>>> been made for the fact Zeus uses face-centred, not cell-centred,
>>>>>> velocities?
>>>>>>
>>>>>> Elizabeth
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>>>>>>
>>>>>>
>>>>>
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