<html><head></head><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:24px"><div style="margin-bottom:0in;margin-bottom:.0001pt;text-align:justify;line-height:150%" id="yui_3_16_0_ym19_1_1522076156589_10554"><span style="font-size:12.0pt;line-height:150%;font-family:"Times New Roman",serif;mso-fareast-font-family:"Times New Roman"" id="yui_3_16_0_ym19_1_1522076156589_10555">Dear
members,<o:p id="yui_3_16_0_ym19_1_1522076156589_10556"></o:p></span></div><div style="margin-bottom:0in;margin-bottom:.0001pt;text-align:justify;line-height:150%" id="yui_3_16_0_ym19_1_1522076156589_10557"><span style="font-size:12.0pt;line-height:150%;font-family:"Times New Roman",serif;mso-fareast-font-family:"Times New Roman"" id="yui_3_16_0_ym19_1_1522076156589_10558"><o:p id="yui_3_16_0_ym19_1_1522076156589_10559"> I'm using WRFV3.8,</o:p></span></div><div style="margin-bottom:0in;margin-bottom:.0001pt;text-align:justify;line-height:150%" id="yui_3_16_0_ym19_1_1522076156589_10560"><span style="font-size:12.0pt;line-height:150%;font-family:"Times New Roman",serif;mso-fareast-font-family:"Times New Roman"" id="yui_3_16_0_ym19_1_1522076156589_10561">I
have a confusion on the use of Smagorinsky and TKE coefficients when i
have to apply them for real case Mesoscale to Large-eddy simulation.<o:p id="yui_3_16_0_ym19_1_1522076156589_10562"></o:p></span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10563"><span id="yui_3_16_0_ym19_1_1522076156589_10567" style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;">In .. /WRFV3/test/em_les/namelist.input, </span><span id="yui_3_16_0_ym19_1_1522076156589_10655" style="font-family: "Times New Roman", serif; font-size: 12pt;">Smagorinsky coeff and TKE coeff are
respectively </span><br></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10572"><span style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;" id="yui_3_16_0_ym19_1_1522076156589_10573"> c_s
= 0.18<o:p id="yui_3_16_0_ym19_1_1522076156589_10574"></o:p></span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10575"><span style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;" id="yui_3_16_0_ym19_1_1522076156589_10576"> c_k
= 0.10<o:p id="yui_3_16_0_ym19_1_1522076156589_10577"></o:p></span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10578"><span style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;" id="yui_3_16_0_ym19_1_1522076156589_10579"><o:p id="yui_3_16_0_ym19_1_1522076156589_10580"> </o:p></span><span style="font-family: "Times New Roman", serif; font-size: 12pt;" id="yui_3_16_0_ym19_1_1522076156589_10697">While, in ../WRFV3/test/em_real/README.namelist</span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10584"><span style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;" id="yui_3_16_0_ym19_1_1522076156589_10585"> c_s
= 0.25 ; Smagorinsky coeff<o:p id="yui_3_16_0_ym19_1_1522076156589_10586"></o:p></span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10587"><span style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;" id="yui_3_16_0_ym19_1_1522076156589_10588"> c_k
= 0.15 ; TKE coeff<o:p id="yui_3_16_0_ym19_1_1522076156589_10589"></o:p></span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10590"><span style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;" id="yui_3_16_0_ym19_1_1522076156589_10591">This is new in WRFV3.7 but this coefficients
were not listed in the namelist.input from em_real directory<o:p id="yui_3_16_0_ym19_1_1522076156589_10592"></o:p></span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10593"><span style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;" id="yui_3_16_0_ym19_1_1522076156589_10594">There is also no detail on these coefficents in
the user's guide.<o:p id="yui_3_16_0_ym19_1_1522076156589_10595"></o:p></span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10596"><span style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;" id="yui_3_16_0_ym19_1_1522076156589_10597"><o:p id="yui_3_16_0_ym19_1_1522076156589_10598"> </o:p></span><span style="font-family: "Times New Roman", serif; font-size: 12pt;" id="yui_3_16_0_ym19_1_1522076156589_10684">1) I would like to understand the meaning of the
difference between these coefficients from Large-eddy simulation to real case
simulation</span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10602"><span style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;" id="yui_3_16_0_ym19_1_1522076156589_10603">2) Can i set these coefficients in my simulation
in real case test? If yes then are they always together or one can make a
choice to set on one of them?<o:p id="yui_3_16_0_ym19_1_1522076156589_10604"></o:p></span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10605"><span style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;" id="yui_3_16_0_ym19_1_1522076156589_10606"><o:p id="yui_3_16_0_ym19_1_1522076156589_10607"> </o:p></span><span style="font-family: "Times New Roman", serif; font-size: 12pt;" id="yui_3_16_0_ym19_1_1522076156589_10685">3) My confusion has increased when i have seen
the details on eddy coefficient options (km_opt) from
WRFV3/test/em_real/README.namelist which purpose is to specify the turbulence
parameterization. </span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10611"><span style="font-size: 12pt; line-height: 150%; font-family: "Times New Roman", serif;" id="yui_3_16_0_ym19_1_1522076156589_10612">So i couldn't know how c_s and c_k are
related to km_opt when i have to use 2D Smagorinsky and 3D TKE1.5. <o:p id="yui_3_16_0_ym19_1_1522076156589_10613"></o:p></span></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10614"><span style="font-family: "Times New Roman", serif; font-size: 12pt;" id="yui_3_16_0_ym19_1_1522076156589_10688">I may be grateful if anyone can give me some
details about my concern</span><br></div><div style="margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;" id="yui_3_16_0_ym19_1_1522076156589_10620"><span style="font-family: "Times New Roman", serif; font-size: 12pt;" id="yui_3_16_0_ym19_1_1522076156589_10689">Regards,</span><br></div><div id="yui_3_16_0_ym19_1_1522076156589_4934">
</div><div style="text-align:justify;line-height:150%" dir="ltr" id="yui_3_16_0_ym19_1_1522076156589_10626"><span style="font-size:12.0pt;line-height:150%;font-family:"Times New Roman",serif" id="yui_3_16_0_ym19_1_1522076156589_10627"><o:p id="yui_3_16_0_ym19_1_1522076156589_10628"> </o:p></span><span style="color: rgb(221, 144, 47); font-size: small; font-style: italic;" id="yui_3_16_0_ym19_1_1522076156589_10687">M. KPAIKPAI Batebana,</span></div><div class="signature" id="yui_3_16_0_ym19_1_1522076156589_4993"><div style="line-height:normal;" id="yui_3_16_0_ym19_1_1522076156589_4992"><span style="color:rgb(221, 144, 47);font-style:italic;font-size:small;" id="yui_3_16_0_ym19_1_1522076156589_6914">Ex-Président de l'ASETOC<br>Doctorant au Laboratoire de Microphysiques et Précipitation Orageuse,<br>Institue de physiques de l’Atmosphère,<br>Université de l’Académie des Sciences de Chine (CAS),</span></div><div style="line-height:normal;" id="yui_3_16_0_ym19_1_1522076156589_6922"><span style="color:rgb(221, 144, 47);font-style:italic;font-size:small;" id="yui_3_16_0_ym19_1_1522076156589_6924">Pékin – Chine<span lang="FR" style="font-weight:bold;margin:0px;line-height:115%;font-family:Calibri, sans-serif;" id="yui_3_16_0_ym19_1_1522076156589_6923"> </span></span></div></div></div></body></html>