[aspect-devel] Evenly spaced vectors, dynamic pressure

[Adam Holt]

Thanks much for the explanation! I'm interested in the component of the pressure that drives flow, so yes it sounds like this "nonadiabatic pressure". (For my incompressible models, I'm assuming this is just total minus hydrostatic pressure.)

I was confused because the "nonadiabatic pressure" output is dominated by a depth-dependent 1-D trend.  I'm assuming this is a numerical/normalization thing, and I just need to remove the horizontal average at all depths.

many thanks,
Adam


________________________________________
From: Aspect-devel [aspect-devel-bounces at geodynamics.org] on behalf of Wolfgang Bangerth [bangerth at colostate.edu]
Sent: Thursday, September 06, 2018 11:20 PM
To: aspect-devel at geodynamics.org
Subject: Re: [aspect-devel] Evenly spaced vectors, dynamic pressure

On 09/06/2018 01:25 PM, Adam Holt wrote:
> Second, I am interested in the dynamic pressure field and wondered how best
> to retrieve it from my (incompressible) models. For such models, I assume
> it can be computed by subtracting the horizontally-constant static pressure
> from the pressure outputted (the 'nonadiabatic pressure' output variable).

I think that the "nonadiabatic pressure" is exactly the "dynamic pressure" you
want: it's the total pressure minus the adiabatic pressure. So there isn't a
need to write anything new, you just need to specify "nonadiabatic pressure"
in the list of visualization variables.

Though it is true that the adiabatic pressure is only computed once at the
beginning of a simulation, and is not equal to the horizontally averaged
pressure. There are, in other words, multiple ways to define a "dynamic
pressure", and you need to specify which one exactly you want in order to
figure out whether there is already an existing visualization postprocessor.

Cheers
  W.

--
------------------------------------------------------------------------
Wolfgang Bangerth          email:                 bangerth at colostate.edu
                            www: http://www.math.colostate.edu/~bangerth/

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