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Sign convention in weak form pde expression

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Hi all,

JM Buchot had earlier posted a model which solves for flow over cylinder using weak form PDE. Weak form expressions of Navier Stokes equations were given as input. But in the expressions he had used, I feel like the signs are reversed for second and third terms in x & y momentum equations (First module in attached .mph file). I get convergence error when the signs are changed.

The actual PDE are as shown in the below link, https://drive.google.com/open?id=1H3QGrROuRchp7QqVMwk-H0yN6KGf1_yf

Please can someone clarify on this.

With thanks & regards, Alwar Samy R



0 Replies Last Post 2018年7月17日 GMT-4 05:56
COMSOL Moderator

Hello Alwar Samy Ramasamy

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