[FLASH-USERS] [EXT] Re: resistivity problems

[Ryan Farber]

I'm not sure what the typical units / scaling FLASH does for magnetic
resistivity, but 1e-18 and below sounds like it's smaller than double point
floating precision. At least as another debugging test you might try a
value of unity.

Best,
--------
Ryan


On Thu, May 4, 2023 at 7:16 PM Adam Reyes <adam.reyes at rochester.edu> wrote:

> Hi Zhao,
>
> I don't see any issues with how you're setting the resistivity. Are your
> simulations producing the magnetic fields that you expect? I'm
> surprised you don't see any differences between the runs at different
> resistivities.
> *************************************************************************
> Adam Reyes
>
> Code Group Leader, Flash Center for Computational Science
> Research Scientist, Dept. of Physics and Astronomy
> University of Rochester
> River Campus: Bausch and Lomb Hall, 369
> 500 Wilson Blvd. PO Box 270171, Rochester, NY 14627
> Email adam.reyes at rochester.edu
> Web https://flash.rochester.edu
>  (he / him / his)
>
> *************************************************************************
>
>
> On Thu, May 4, 2023 at 10:34 AM 赵旭 <xuzhao1994 at sjtu.edu.cn> wrote:
>
>> Dear Adam,
>>
>> Thank you very much for your reply.
>>
>> This simulation is try to use FLASH to simulate the magnetic reconnection
>> in a 'coil' target configuration.
>>
>> I tried to set the resistivity from 0, 1e-20, and 1e-18 (for testing),
>> respectively.
>>
>> I want to see the transition from magnetic energy to kinetic energy when
>> the reconnection occurs.
>>
>> However, it seems nothing changes in these simultions (Both plasma
>> evolution and the value of magnetic energy/kinetic energy).
>>
>> The log and .par file are attached.
>>
>> Any suggestion helps as I have struggled for a while for this problem.
>>
>> Best,
>> Zhao
>>
>> ----- 原始邮件 -----
>> 发件人: "Adam Reyes" <adam.reyes at rochester.edu>
>> 收件人: "赵旭" <xuzhao1994 at sjtu.edu.cn>
>> 抄送: "flash-users" <flash-users at flash.rochester.edu>
>> 发送时间: 星期四, 2023年 5 月 04日 下午 9:51:44
>> 主题: Re: [FLASH-USERS] resistivity problems
>>
>> Hi Zhao,
>>
>> Do you have a logfile from the FLASH simulation that you could share?
>> These
>> contain details of how the code was configured for your simulation so we
>> can give a more specific suggestion.
>>
>> *************************************************************************
>> Adam Reyes
>>
>> Code Group Leader, Flash Center for Computational Science
>> Research Scientist, Dept. of Physics and Astronomy
>> University of Rochester
>> River Campus: Bausch and Lomb Hall, 369
>> 500 Wilson Blvd. PO Box 270171, Rochester, NY 14627
>> Email adam.reyes at rochester.edu
>> Web https://flash.rochester.edu
>>  (he / him / his)
>>
>> *************************************************************************
>>
>> On Thu, May 4, 2023 at 9:43 AM 赵旭 <xuzhao1994 at sjtu.edu.cn> wrote:
>>
>> > Dear FLASH users/developers,
>> >
>> >
>> > When I want to set up a non-ideal plasma magnetic resistivity condition
>> in
>> > 3D laser-driven experiment simulation, a mistake trouble me.
>> >
>> > I change the resistivity of plasma at constant condition, but the
>> > simulation results didn't change. I use the CGS system. Do I made any
>> > mistakes in in FLASH?
>> >
>> > Any suggestion helps.
>> >
>> >
>> > Zhao
>> >
>> > --
>> > Zhao Xu
>> > Laboratory for Laser Plasmas (MoE)
>> > Shanghai Jiao Tong University
>> > 800 Dongchuan Rd, Shanghai 200240
>> > _______________________________________________
>> > flash-users mailing list
>> > flash-users at flash.rochester.edu
>> >
>> > For list info, including unsubscribe:
>> > https://flash.rochester.edu/mailman/listinfo/flash-users
>> >
>> --
>> Zhao Xu
>> Laboratory for Laser Plasmas (MoE)
>> Shanghai Jiao Tong University
>> 800 Dongchuan Rd, Shanghai 200240
>>
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