Rayleigh Damping

Numerical methods and mathematical models of Elmer
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kevinarden
Posts: 2237
Joined: 25 Jan 2019, 01:28
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Rayleigh Damping

Post by kevinarden »

The ElmerModel manual says this

Material mat id
The material section is used to give the material parameter values. The following material parameters
may be set in Navier equations.
Rayleigh Damping Logical
Apply rayleig damping.
Rayleigh Damping Alpha Real
Rayleigh Damping Beta Real
The parameters of Rayleigh damping.

my material

Material 2
Name = "Generic"
Poisson ratio = 0.3
Youngs modulus = 2.E9
Density = 10
Mesh Poisson ratio = 0.35
Rayleigh damping = true
Rayleigh damping Alpha = .004
Rayleigh damping Beta = 1.3
End

Results in

MAIN: Reading Model: case_run.sif
LoadInputFile: Scanning input file: case_run.sif
ERROR:: Model Input:
ERROR:: Model Input: Unknown specifier: [true]
ERROR:: Model Input: In section: [material 2]
ERROR:: Model Input: For property name:[rayleigh damping]

Anyone know what I missed?
mzenker
Posts: 1999
Joined: 07 Dec 2009, 11:49
Location: Germany

Re: Rayleigh Damping

Post by mzenker »

Hi,

it sould work if you write

Rayleigh damping = Logical true

There is a SOLVER.KEYWORDS file in the lib directory of the Elmer installation. The "Rayleigh damping" keyword is not listed there, so Elmer doesn't know that it is logical.

HTH,
Matthias
kevinarden
Posts: 2237
Joined: 25 Jan 2019, 01:28
Antispam: Yes

Re: Rayleigh Damping

Post by kevinarden »

Thank You
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