40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
Message ID: 282     Entry time: Fri Aug 13 20:23:33 2010
Author: Tara 
Type: Notes 
Category: NoiseBudget 

I tried to separately mesh the geometry.

Only the small part (1/2 radius, 1/3 thickness) is extremely fine mesh, the rest is regular mesh, see fig1.

The result looks similar, with shorter time for calculation.

Also, the contact area between the mirror and the spacer

is modeled as a constant temperature (@ 35 C)boundary condition.

 The temperature profile across the surface,

nd the temperature difference along the depth due to RIN is plotted below.

The area under the curve for T,Z is 6.1e-9 [meter.Kelvin]

 Expansion coeff for SIO2 is 5.1e-7. Thus, dL = 3.1e-15m.

Use df/f = dL/L, L =0.2035m, we get df = 4.5 Hz.


As for thin coatings, I tried swept mesh, which creates prisms of quadrilateral surface.

However, when I ran the simulation, there are warnings about

ill-precondition from the size of the coatings.

After a talk with Greg's SURF student, he wrote a code similar to what I'm doing.

I'll try MATLAB code this time.

Attachment 1: mesh.png  180 kB  | Hide | Hide all
Attachment 2: contact.png  11 kB  | Hide | Hide all
Attachment 3: TR.png  5 kB  | Hide | Hide all
Attachment 4: dT_Z.png  11 kB  | Hide | Hide all
ELOG V3.1.3-