Dear Dr.Rajalakshmi,

This depend upon the value of dt that you have set in timeparam stanza of input namelist of the RegCM.

A good rule of thumb is to have a dt not greater than three times the ds value in km specified in the geoparam stanza. A greater value may lower the computational time, but in case of strong advection may lead to non-accurate computation or even the violation of CFL condition and the divergence of the solution.

Best Regards

From: regcnet-bounces@lists.ictp.it [mailto:regcnet-bounces@lists.ictp.it] On Behalf Of Rajalakshmi Dhandapani
Sent: Thursday, February 20, 2014 2:01 PM
To: regcnetusers
Subject: [RegCNET] RegCM 4 - HadGEM2 RCP4.5 data taking more run time

Dear all,

 I am using RegCM4.4 rc22 for model run over India using HadGEM2 RCP 4.5 dataset. Run was tried for 60km and 25 km. Model is taking 1 hour to complete one day for 25km run and 45 minutes for 60 km run. I have to run the model from 1971-2100. Can anyone suggest the reason why the model is taking so much time for a day. Is there a way to reduce the time taken by the model?

Kindly give suggestions regarding the issue.

Thanks and regards

--
Dr. D. Rajalakshmi,
Research Associate,
Agro Climate Research Centre,
Tamil Nadu Agricultural University,
Coimbatore - 641003.