Re: [Libmesh-users] question about example transient_ex2.C

[Povolotskyi, M. <mpo...@pu...>]

Thank you, Roy.
One more question, please.
How can I get  dp/dt, if I need? Is there an existing solution for this?
Thank you!

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From: John Peterson<mailto:jwp...@gm...>
Sent: Monday, March 4, 2019 12:38 PM
To: Povolotskyi, Mykhailo<mailto:mpo...@pu...>
Cc: libmesh-users<mailto:lib...@li...>
Subject: Re: [Libmesh-users] question about example transient_ex2.C



On Mon, Mar 4, 2019 at 11:34 AM Michael Povolotskyi <mpo...@pu...<mailto:mpo...@pu...>> wrote:

Thank you.

Couple of more questions:

1. You have p and u variables in your equation. Is this a misprint?

Yes, sorry there is only one variable, p.


2. It seems there is also a force term. In the example you integrate it over a surface. Can I have a volume force, to solve something like this:

(1/c^2) d^2 p / dt^2 - Laplacian(p) + F = 0 ?

Sounds reasonable to me.


3. Where cam I read about the Newmark method of solution, that you have implemented?

I would assume it something similar to this:

https://en.wikipedia.org/wiki/Newmark-beta_method

but of course looking at the code to see what it does is your best bet...

--
John