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Hi there,<div><br></div><div> I'm trying to add a uniform background flow field (U=0.1m/s) to my 2D (x-z) simulation, which is laterally homogeneous and vertically uniformly stratified. To avoid obvious noise induced by flow-topography interaction, I hope the background flow field firstly grow <span style="line-height: 22.4px;">slowly </span><span style="line-height: 1.6;">and then remain stable.</span></div><div><span style="line-height: 1.6;"> I tried to use U_init+OBCS or RBCS to do that, but the result seem not so reasonable. I think the better way is to apply an additional forcing to the rhs of momentum equation (x: -fV; y: fU). So I altered the '</span><font face="Terminal">myPa_TendVelV</font>' to fU in '/pkg/mypackage/mypackage_init_varia.F' and enabled this <span style="line-height: 22.4px;">package and run for 12 hours. The result shows a gorwing U field (0 to 0.03m/s or so generally, bigger or smaller values at topography) but didn't reach 0.1 m/s at the end (12hr modeltime).</span></div><div><span style="line-height: 22.4px;"> So,</span></div><div><span style="line-height: 22.4px;"> 1. Is this a right way to adding uniform background field, any way to do this easier?</span></div><div><span style="line-height: 22.4px;"> </span><span style="line-height: 22.4px;"> </span><span style="line-height: 22.4px;">2. By RBCS relaxing the flow field also makes U grow </span><span style="line-height: 22.4px;">gradually</span><span style="line-height: 22.4px;"> from 0 to ~0.1. These show dramatic distinct patterns, which is more reasonable ?</span></div><div><span style="line-height: 22.4px;"><br></span></div><div><span style="line-height: 22.4px;">Thanks.</span></div><div><span style="line-height: 22.4px;">Jianing Li</span></div><div>----------this is how I modified 'mypackage'----------</div><div># mypackage_init_varia.F:</div><div>line 50: myPa_TendVelV (i,j,k,bi,bj) = 4.E-6</div><div><br></div><div># MYPACKAGE_OPTIONS.h</div><div>line 14: #undef MYPACKAGE_2D_STATE</div><div><br></div><div>#data.mypackage(whole file):</div><div><div> &MYPACKAGE_PARM01</div><div> myPa_MNC=.FALSE.,</div><div><span style="line-height: 22.4px;"> </span>myPa_applyTendU=.TRUE.,</div><div> <span style="line-height: 22.4px;"> </span><span style="line-height: 1.6;">myPa_applyTendV=.TRUE.,</span></div><div><span style="line-height: 22.4px;"> </span>&</div></div><div>-----------------------------------------------------------</div><div><br></div><!--😀-->
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