Abnormal time-consuming solving frictional contact problems

[Archiver]

Dear all,

I have a MCP, concerning a frictional contact problem of two cantilever beams, that I wish to solve.

Attached is the gams model and 2 data sets （DAT1.dat and DAT2.dat).

DAT2 is a refined mesh of the same problem. DAT2 has 7974 nodes while DAT1 has 2118 nodes.


My question:

Why does the MCP solver take far larger time of DAT2 than that of DAT1 ( 95s compared to 2.7s )?

I am using PATH solver, GAMS 24.6.1.

Many thanks,
Weiwei

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[Archiver]

WeiWei:


I solve the larger (DAT2) problem in about 36 sec using PATH's emulation of Lemke's method.


I am sure Steve Dirkse / Michael Ferris can do much better.


Cheers

Francis Tin-Loi


From: gamsworld@googlegroups.com on behalf of weiwei
Sent: Wednesday, 24 February 2016 10:42 AM
To: gamsworld
Subject: Abnormal time-consuming solving frictional contact problems

Dear all,

I have a MCP, concerning a frictional contact problem of two cantilever beams, that I wish to solve.

Attached is the gams model and 2 data sets （DAT1.dat and DAT2.dat).

DAT2 is a refined mesh of the same problem. DAT2 has 7974 nodes while DAT1 has 2118 nodes.


My question:

Why does the MCP solver take far larger time of DAT2 than that of DAT1 ( 95s compared to 2.7s )?

I am using PATH solver, GAMS 24.6.1.

Many thanks,
Weiwei

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