View source for Thin Layers of Low TI Material

From krc

You do not have permission to edit this page, for the following reason:

The action you have requested is limited to users in the group: Users.

You can view and copy the source of this page:

=Description=

Running KRC cases with layering (see [[Material Properties and Regolith Layering]] for information on layering), scenarios can be encountered where thin layers are desired. When sufficiently thin layers are encountered, the time step requirement can be very small and KRC will fail to run. In order to bypass this, we can enforce a smaller time step using the 'N2' field.

The below examples are relevant to the case found in the '''thin.pdf''' (page 10) within directory '/doc'.

=Examples=

For the following examples, we consider default KRC values and a case where a lower-TI "dust-like" layer (50 J m^-2 K^-1 s^-1/2) overlies a higher-TI layer (250 J m^-2 K^-1 s^-1/2).

When the low-TI layer is thinner than ~100 microns, KRC may fail to run.

Example:
 krc(lat=0.,INERTIA=50.,INERTIA2=250.,thick=64.E-6,LKofT="T",ALBEDO=0.2)
 >
 '''KRC failed to run for some reason'''

For the reference material properties (default), the necessary time step in this case (64 micron upper layer thickness) is N2=98304.

Re-running the case with the N2 field updated executes as expected:

 krc(lat=0.,INERTIA=50.,INERTIA2=250.,thick=64.E-6,LKofT="T",ALBEDO=0.2,N2=98304)

The thinnest upper layer for these material properties is 32 microns. The associated time step requirement, N2=393216.

 krc(lat=0.,INERTIA=50.,INERTIA2=250.,thick=32.E-6,LKofT="T",ALBEDO=0.2,N2=393216)

Return to Thin Layers of Low TI Material.

Retrieved from "https://krc.mars.asu.edu/index.php?title=Thin_Layers_of_Low_TI_Material"

View source for Thin Layers of Low TI Material

Views

Personal tools

Navigation

Search

Tools