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        Hi everyone!
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        I'm trying to use the rbcs package to reduce the velocity close to zero when temperature is lower than 1700 K. 
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        I find that U/V can be reduced to be more close to zero when the relaxation timescale for U/V (<span style="font-family:SimSun;">tauRelaxU, tauRelaxV</span>) is as small as possible.
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        However, the simulation is stable only when <span style="font-family:SimSun;text-wrap:wrap;">tauRelaxU and tauRelaxV ≥4000 s and deltaTmom = 600 s if planetary rotation is included, and lower deltaTmom and <span style="font-family:SimSun;text-wrap:wrap;">tauRelaxU/V will result in numerical instability.</span></span>
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        <span style="font-family:SimSun;text-wrap:wrap;">The simulation can be stable even when <span style="font-family:SimSun;text-wrap:wrap;">tauRelaxU/V = 400 s and <span style="font-family:SimSun;text-wrap:wrap;">deltaTmom = 100 s when planetary rotation is not included.</span></span></span>
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        <span style="font-family:SimSun;text-wrap:wrap;"><span style="font-family:SimSun;text-wrap:wrap;"><br>
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        <span style="font-family:SimSun;text-wrap:wrap;"><span style="font-family:SimSun;text-wrap:wrap;">I don't know how to use a lower <span style="font-family:SimSun;text-wrap:wrap;">tauRelaxU/V when planetary rotation is included, do you have any suggestions? </span></span></span>
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        <span style="font-family:SimSun;text-wrap:wrap;"><span style="font-family:SimSun;text-wrap:wrap;">Thanks in advance!</span></span>
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        <span style="font-family:SimSun;text-wrap:wrap;"><span style="font-family:SimSun;text-wrap:wrap;"><br>
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        <span style="font-family:SimSun;text-wrap:wrap;"><span style="font-family:SimSun;text-wrap:wrap;">Best,</span></span>
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        <span style="font-family:SimSun;text-wrap:wrap;"><span style="font-family:SimSun;text-wrap:wrap;">Yanhong</span></span>
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