[Nek5000-users] Parameters lx3, ly3 and lz3
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Sun Aug 16 11:03:11 CDT 2015
Hi Paul,
Thank you very much for clarifying.
Best,
Tony
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From: nek5000-users-bounces at lists.mcs.anl.gov <nek5000-users-bounces at lists.mcs.anl.gov> on behalf of nek5000-users-request at lists.mcs.anl.gov <nek5000-users-request at lists.mcs.anl.gov>
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Today's Topics:
1. Re: Parameters lx3, ly3 and lz3 (nek5000-users at lists.mcs.anl.gov)
2. Re: Parameters lx3, ly3 and lz3 (nek5000-users at lists.mcs.anl.gov)
3. Re: Infinite Prandtlnumber with Nek5000
(nek5000-users at lists.mcs.anl.gov)
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Message: 1
Date: Fri, 14 Aug 2015 18:55:42 +0000
From: nek5000-users at lists.mcs.anl.gov
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Subject: Re: [Nek5000-users] Parameters lx3, ly3 and lz3
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Dear Neks,
Does anyone have any clue on the lx3, ly3 and lz3 set-ups below?
Best,
Tony
________________________________________
Message: 3
Date: Wed, 12 Aug 2015 02:04:09 +0000
From: nek5000-users at lists.mcs.anl.gov
To: "nek5000-users at lists.mcs.anl.gov"
<nek5000-users at lists.mcs.anl.gov>
Subject: [Nek5000-users] Parameters lx3, ly3 and lz3
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Dear Neks,
I've got a quick question about the parameters lx3, ly3 and lz3. These are the parameters for mesh3, but I'm not sure how they work in the code. For velocity and pressure, I would assume we only use mesh1 and mesh2. I'm just wondering is it necessary to set lx3 to be equal to lx1 (if I'm using PnPn-2)? Or does it matter whether it is equal to lx1 or lx2?
Hope anyone could help with this. Thank you very much in advance.
Best regards,
Tony
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Message: 2
Date: Fri, 14 Aug 2015 20:26:17 +0000
From: nek5000-users at lists.mcs.anl.gov
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Subject: Re: [Nek5000-users] Parameters lx3, ly3 and lz3
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Hi Tony,
Most often I take lx3=lx1.
I have had occasions where lx3=lx2 was required -- e.g., a tapered cylinder flow
using Pn-Pn-2 (lx2=lx1-2).
lx3 governs the degree of polynomial for the geometry.
Best,
Paul
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From: nek5000-users-bounces at lists.mcs.anl.gov [nek5000-users-bounces at lists.mcs.anl.gov] on behalf of nek5000-users at lists.mcs.anl.gov [nek5000-users at lists.mcs.anl.gov]
Sent: Friday, August 14, 2015 1:55 PM
To: nek5000-users at lists.mcs.anl.gov
Subject: Re: [Nek5000-users] Parameters lx3, ly3 and lz3
Dear Neks,
Does anyone have any clue on the lx3, ly3 and lz3 set-ups below?
Best,
Tony
________________________________________
Message: 3
Date: Wed, 12 Aug 2015 02:04:09 +0000
From: nek5000-users at lists.mcs.anl.gov
To: "nek5000-users at lists.mcs.anl.gov"
<nek5000-users at lists.mcs.anl.gov>
Subject: [Nek5000-users] Parameters lx3, ly3 and lz3
Message-ID:
<mailman.5516.1439345056.24727.nek5000-users at lists.mcs.anl.gov>
Content-Type: text/plain; charset="iso-8859-1"
Dear Neks,
I've got a quick question about the parameters lx3, ly3 and lz3. These are the parameters for mesh3, but I'm not sure how they work in the code. For velocity and pressure, I would assume we only use mesh1 and mesh2. I'm just wondering is it necessary to set lx3 to be equal to lx1 (if I'm using PnPn-2)? Or does it matter whether it is equal to lx1 or lx2?
Hope anyone could help with this. Thank you very much in advance.
Best regards,
Tony
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Message: 3
Date: Sat, 15 Aug 2015 00:43:43 +0200
From: nek5000-users at lists.mcs.anl.gov
To: nek5000-users at lists.mcs.anl.gov
Subject: Re: [Nek5000-users] Infinite Prandtlnumber with Nek5000
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hello, Jan,
great that you have tested them. I always want to try, but am too lasy...
Could you say a little bit about the aphysical
oscillations? Do you see oscillations for one iteration, or they appear
because of the
time stepping approach I suggested? Sometimes I indeed see this in the
velocity field
for a low-quality mesh with low GLL numbers, normally the spatial
velocity oscillations
are gone by either using a mesh with better quality (same GLL) or
increasing the number GLL points for
the same mesh.
I think the way suggested by Paul will significantly speedup the
simulation compared to the way
I suggested, although trivial inertia is introduced. have you observed
the speedup?
thanks,
lailai
On 2015/8/14 9:00, nek5000-users at lists.mcs.anl.gov wrote:
> Hi Paul,
> thanks for the advice. I tested some simple 2D cases and the method
> seems to work quite good. The idea in the other posts had a tendency
> to produce unphysical oscillations. We might look into testing Nek
> against other mantle convection codes, where varying viscosity and
> parallelisation is still a problem.
>
> Thanks again,
> Jan
> _______________________________________________
> Nek5000-users mailing list
> Nek5000-users at lists.mcs.anl.gov
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--
Lailai Zhu
Laboratory of Fluid Mechanics and Instabilities LFMI
EPFL STI IGM LFMI ME A2 408 (B?timent ME) Station 9
CH-1015 Lausanne Switzerland
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